Chinese scientists hunt for alien radio signals in 'potentially habitable' TRAPPIST-1 system

By Mark Thompson

Researchers in China have conducted the most thorough search yet for alien radio signals in the nearby TRAPPIST-1 system, which may harbor potentially Earth-like planets.

Trappist-1, seen here in this illustration with the Sun for scale, has been the target of the search for extra-terrestrial signals. 

(Image credit: CactiStaccingCrane)

TRAPPIST-1 is a red dwarf star located about 40 light years away that hosts seven Earth sized rocky planets, with at least three orbiting in the habitable zone where liquid water could potentially exist. This makes it one of the most Solar System like exoplanet systems discovered, with TRAPPIST-1e considered among the best potentially habitable exoplanets. The system's proximity and multiple potentially habitable worlds make it an ideal target for searching for technological civilizations.

The research team conducted their search using the Five hundred meter Aperture Spherical Telescope (FAST) to exploit its unprecedented sensitivity. The observations consisted of five independent L-band pointings, each with a 20 minute integration, for a total time of 1.67 hours. The frequency coverage spanned 1.05 to 1.45GHz with a spectral resolution of ~7.5Hz allowing them to detect extremely weak radio signals that might indicate alien technology.

The team led by Guang-Yuan Song from the Dezhou University in China looked for very precise radio frequencies that slowly changed over time due to planetary motion.

Related: 

• Will the James Webb telescope lead us to alien life? Scientists say we're getting closer than ever.

Such signals would be virtually impossible to produce naturally and would strongly suggest artificial origin from an advanced civilization. Based on the configuration of FAST, the researchers had the ability to detect radio signals as weak as 2.04×10^10 watts. This means they were able to detect fainter signals than any previous studies. If there were aliens transmitting radio signals regularly on a specific frequency, this study would be more likely to find them than earlier attempts.​​​​​​​​​​​​​​​​

Alas, the search found no convincing evidence of alien technology. However, rather than being disappointing, this result still provides valuable scientific information. It places upper limits on the presence of certain types of alien transmitters in the TRAPPIST-1 system and demonstrates the remarkable capabilities of modern SETI searches.

RELATED STORIES

• Potentially habitable planet TRAPPIST-1b may have a carbon dioxide-rich atmosphere
• Will the James Webb telescope lead us to alien life? Scientists say we're getting closer than ever.
• Cosmic rays could help support alien life on worlds outside the 'Goldilocks zone'

It may be some years or even decades before we can completely rule out life in the TRAPPIST-1 system but at least for now, it remains a compelling target for future SETI efforts. The team plans to expand their search to look for other types of signals, including periodic or transient transmissions that might be missed by current methods.

The search for extraterrestrial intelligence remains one of our most profound scientific endeavors, with the potential to fundamentally transform our understanding of our place in the universe. As we continue to peer out into space with ever greater precision, we're not just looking for aliens, we're taking the first steps toward what may be the most significant moment in human history.​​​​​​​​​​

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{ https://www.livescience.com/space/extraterrestrial-life }

15-09-2025 om 22:27 geschreven door peter  

Scientists measure the 'natal kick' that sent a baby black hole careening through space for the first time

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"It's a remarkable demonstration of what gravitational waves can do," study co-author Koustav Chandra, an astrophysicist at Pennsylvania State University said in a statement.

Collision signals

When black holes careen toward one another they produce gravitational waves. But when one black hole is much more massive than the other, the gravitational waves produced look very different depending on the angle from which they are observed.

By looking from different angles, researchers can find the direction of the kick. Then, the kick’s speed can be determined by measuring the mass ratio and spin of the two original black holes — information that can also be determined from studying gravitational waves.

Related: 

• Scientists detect most massive black hole merger ever — and it birthed a monster 225 times as massive as the sun

If the recoil from the collision is strong enough to slingshot the merged black hole from its star cluster, this prevents this new black hole from subsequently merging with other black holes and potentially forming a supermassive black hole — which can be 100,000 to 50 billion times the mass of the sun. This makes understanding the speed and direction of kicks essential for tracking the formation of supermassive black holes.

In 2018, study co-author Juan Calderón Bustillo and his colleagues figured out exactly how to measure the natal kick based on these gravitational wave signals. But their model had to rely on simulations, as no black hole merger resulting in a recoil had been detected at that point.

Then, on April 12, 2019, the Advanced LIGO detectors in Louisiana and Washington State and the Virgo detector in Italy recorded the GW190412 picked up a signal resulting from two stellar-mass black holes merging: One 29.7 times as massive as the sun and the other 8.4 times as massive.

Despite taking place more than 2.4 billion light-years away from Earth, the researchers used two angles relative to Earth to determine where the kick sent the newborn black hole. It raced away from its birth site, likely a dense grouping of stars called a globular cluster, at an astonishing 111,600 miles per hour (179,600 kilometers per hour). This speed would be more than enough to enable it to escape the cluster and become a runaway black hole.

"This is one of the few phenomena in astrophysics where we're not just detecting something," Chandra said. "We're reconstructing the full 3D motion of an object that's billions of light-years away, using only ripples in spacetime."

The team’s next steps will be to look for more black hole mergers to measure with both gravitational waves and visible light, a search that could yield deeper insights into how the cosmic monsters grow.

{ https://www.livescience.com/space }

15-09-2025 om 22:14 geschreven door peter  

Scientists reveal exactly what will happen if the Earth continues to spin faster - including devastating earthquakes and catastrophic flooding

• READ MORE: Experts blame climate change for the record–breaking summer

By JONATHAN CHADWICK, ASSISTANT SCIENCE & TECHNOLOGY EDITOR 

You may already feel as if there’s not enough time in the day. 

But it's not just your imagination – the days have been getting shorter. 

According to scientists, July 9, July 22 and August 5 this year were between 1.3 and 1.51 milliseconds shorter than the standard 24-hour day. 

Although the exact reason is still a mystery, there could be several causes, such as changes in the atmosphere, the melting of glaciers, motion in the Earth's core, and a weakening magnetic field.

While the loss of a few milliseconds is not a cause for too much concern, a frightening new book imagines a world literally 'spinning out of control'.

In 'Circular Motion' by Alex Foster, days on Earth last 23 hours, then 20 hours, and then eventually two hours.

Like a supercharged spinning top, the planet spins so fast that even gravity loses its grip, as the sun rises and sets ever faster. 

Now, experts reveal the real implications of such a terrifying scenario, from large-scale disasters, floods and earthquakes. 

A new novel called 'Circular Motion' by Alex Foster imagines a world literally spinning out of control, until a day last just two hours 

In Foster's new novel, Earth's rotation speeds up due to a network of massive aircraft that orbit the Earth at 30,000 feet, revolutionising global transportation. 

The acceleration of Earth’s spin begins gradually, and days are just a few seconds shorter than normal, so nobody initially notices. 

However, Earth’s spin progressively gets faster and faster until a day lasts just two hours – triggering a global catastrophe. 

If Earth's spin really did get faster, experts say it cause a 'centrifugal effect' where the things start to swing away from the planet's axis, much like the hanging chairs on a spinning carousel ride.

Earth's oceans would start to bulge around the equator, giving the planet more of a diamond shape, with sloping northern and southern hemispheres. 

Water pulled from the polar regions (where centrifugal force is low) would cause the Arctic Ocean to become shallower and send the equatorial region underwater. 

Even land around the equator that's not underwater could have a greatly increased chance of tsunamis and flooding. 

Duncan Agnew, professor of geophysics at the University of California San Diego, said the 'largest changes would be in the ocean tides'. 

This long-exposure photo of the northern night sky above the Nepali Himalayas shows the apparent paths of the stars as Earth rotates. If Earth spun fast enough, is this what we would see?

According to scientists, July 9, July 22 and August 5 this year were between 1.3 and 1.51 milliseconds shorter than the standard 24-hour day . Although the exact reason is still a mystery, there could be several causes, such as changes in the atmosphere, the melting of glaciers, motion in the Earth's core, and a weakening magnetic field (stock image)

Could the world keep going faster?

It is unlikely that the world will start to spin faster. In fact, the world is actually slowing down over time.

About 4.4 billion years ago, the planet was spinning so fast that days lasted four minutes. But this slowed down after a large object hit Earth and created the moon.

The only way Earth could speed up is if a large object hits at just the right angle. But this would likely liquify the planet's crust, so no humans would survive to see the results.  

As any beach-goer knows, in coastal areas around the world there are high tides and low tides, which are due to the gravitational pull of the moon and the sun, combined with the rotation of Earth.  

The daily rotation of the Earth produces two high tides and two low tides every 24 hours and 50 minutes. 

'Change that by 10 per cent and the tides in some places would get larger and in others smaller,' Professor Agnew told the Daily Mail. 

Also, the faster the Earth's spin, the faster tectonic plates would move, would could add to more geological stress and 'a lot of earthquakes', the academic added. 

It’s worth remembering that the equator (where Earth’s circumference is the widest) spins faster than elsewhere, such as the tropics or the poles. 

The equator spins at about 1,025 miles (1,650km) per hour, while the poles spin barely above zero miles per hour. 

As Earth spins and we go around with it, we are held into place by gravity, but if the Earth spun fast enough, centrifugal force would overcome gravity, causing objects to be flung into space. 

'The faster Earth turns, the more gravity will be canceled out and the lighter you’ll feel,' said Foster in a piece for New Scientist. 

Hurricanes will spin faster and carry more energy if the world's spin greatly increases, researchers claim. In this picture from space, a swirling hurricane forms

The faster Earth's spin, the faster tectonic plates would move, would could add to more geological stress and 'a lot of earthquakes'. Pictured, damage from Afghanistan earthquake, September 4, 2025

NASA astronomer Dr Sten Odenwald also warned that weather phenomena would become more extreme, capable of causing more damage. 

As the planet spins faster, an apparent force known as the Coriolis effect, which gives hurricanes their spin, intensifies. 

'Hurricanes will spin faster and carry more energy,' Dr Odenwald said.

If Earth’s spin increased, there would of course also be both less sunlight in the day and less time to sleep at night, which might make humans less productive. 

People would have keep putting their clocks back as the days shortened, or come up with a whole new time-keeping system.

Humans have a 'circadian rhythm' – an internal clock that is closely attuned to the 24-hour day – which can cause physical and mental issues if disrupted (by factors like plane travel).

Additionally, many satellites would no longer be positioned correctly, which could disrupt satellite communications, internet, TV broadcasting and more.

Luckily, Professor Agnew said the idea of Earth's rotation speeding up to the extent portrayed in the new novel is a 'particularly absurd premise'. 

Each day on Earth contains 86,400 seconds, but the rotation isn't uniform, which means over the course of a year, each day has a fraction of a second more or less

'This cannot happen and nothing like it has ever been observed for any planet or star,' Professor Agnew told the Daily Mail. 

In actual fact, the Earth has been rotating more and more slowly over the long-term, but this change has been very gradual.

'A billion years ago the day was maybe 19 hours long,' he told the Daily Mail. 

'If you went back to when there were dinosaurs and didn't have a clock you wouldn't probably notice that the day was 30 minutes shorter.' 

Dr Judah Levine, Fellow of the US government's National Institute of Standards and Technology (NIST) in Maryland, also questioned how close the book's premise is to 'real physics'. 

'If the story is loosely connected to reality, then the speed-up of Earth had to be accompanied by something else losing angular momentum, maybe the orbit of the moon,' he told the Daily Mail. 

'This is a fundamental principle.'

Maybe the orbit of the moon losing angular momentum could cause the speed-up of Earth, he added.  

'If that is what happens, the moon gets a lot closer, and the tidal effects become much stronger and more frequent because the periods are driven by the length of the day.' 

{ https://www.dailymail.co.uk/sciencetech/index.html }

15-09-2025 om 20:51 geschreven door peter  

Earth has another moon! Hidden 'quasi-moon' has been following our planet for decades, astronomers reveal

• READ MORE:  NASA finds clearest sign of life on Mars

By XANTHA LEATHAM, EXECUTIVE SCIENCE EDITOR

For the last 4.5 billion years our planet has had a reliable celestial companion – the moon.

Its orbit around the Earth has a profound effect on life here, from influencing the tides to stabilising our seasons.

But astronomers have now discovered another sidekick that may have been following our planet around for some time.

Experts at the Pan-STARRS observatory in Hawaii have spotted a quasi-moon, called ‘2025 PN7’, that has been tagging along after Earth since the 1960s.

This cosmic body is actually an asteroid, they explained, and – rather than orbit the Earth – it is orbiting the Sun on a similar trajectory to our planet.

The astronomers made the discovery after analysing orbital data from the asteroid, which is just 19 metres (62ft) wide.

They determined it has been in a quasi-orbit for around 60 years and would likely be nearby for another 60 years or so before departing.

It joins the six other known quasi-moons in Earth-like orbits - but boasts the title of the ‘smallest and the least stable’.

Experts have spotted a quasi-moon, an asteroid called ‘2025 PN7’, that has been tagging along after Earth since the 1960s

(stock image)

Scientists have been aware of quasi-satellites since 1991 when they first discovered ‘1991 VG’ – which some believed to be an alien probe at the time.

‘Over three decades later, it is now widely accepted that such objects are natural and constitute a secondary asteroid belt that occupies the region in which the Earth-moon system orbits around the sun,’ the researchers wrote.

Unlike our moon, which can usually been seen with the naked eye, this quasi-moon is only visible through good telescopes.

And although it may appear to be orbiting Earth it is not gravitationally bound to our planet.

While it may sound like this neighbour has been ‘following’ Earth for quite some time, it’s relatively short compared to another famous quasi-moon, Kamo’oalewa, which has an Earth-related orbit lasting around 381 years.

Quasi-moons are part of a special category of space objects called Arjunas, that move in sync with our planet’s journey around the sun.

2025 PN7 maintains a wide range of distances from Earth – anywhere between around 2.8 million miles (4.5 million km) and 37 million miles (59 million km).

These quasi-moons in Earth-like orbits are ‘full of surprises’ co-author Carlos de la Fuente Marcos, from the Complutense University of Madrid, told Live Science.

Earth's orbit around the Sun (blue) contrasted with that of its quasi-moon Kamo'oalewa (yellow, labeled with its provisional designation 2016 HO3). The large yellow circle traces just one of the quasi-moon's orbits around the Sun. Over many orbits, it also traces the series of loops around Earth shown to the right

This new quasi-moon is ‘small, faint and visibility windows from Earth are rather unfavourable, so it is not surprising that it went unnoticed for that long,’ he explained.

The Vera C. Rubin Observatory in Chile, which recently became operational, can scan for other quasi-moons and ‘may uncover many more’.

The latest discovery was recently published in Research Notes of the AAS.

Alongside quasi-moons the Earth is sometimes joined by ‘minimoons’ – objects that do orbit our planet but only temporarily.

Only four have ever been discovered, and none are still orbiting Earth.

Experts from The Planetary Society said: ‘Quasi-moons and minimoons are pieces of our neighbourhood in space, and they carry information about where they come from. They might originate in the main asteroid belt, from impacts on the Moon, or from the break-up of larger objects on similar orbits — scientists don’t know for sure.

‘Answering that question, and finding out what these almost-moons are made of, can help researchers learn more about asteroids and how they threaten Earth.’

The phases of the moon

Like Earth, the Moon has a day side and a night side, which change as the Moon rotates. 

The Sun always illuminates half of the Moon while the other half remains dark, but how much we are able to see of that illuminated half changes as the Moon travels through its orbit.

In the Northern Hemisphere, the phases of the moon are:

1. New Moon

This is the invisible phase of the Moon, with the illuminated side of the Moon facing the Sun and the night side facing Earth.

2. Waxing crescent

This silver sliver of a Moon occurs when the illuminated half of the Moon faces mostly away from Earth, with only a tiny portion visible to us from our planet.

3. First Quarter 

The Moon is now a quarter of the way through its monthly journey and you see half of its illuminated side. 

4. Waxing Gibbous

Now most of the Moon's dayside has come into view, and the Moon appears brighter in the sky. 

5. Full Moon

This is as close as we come to seeing the Sun's illumination of the entire day side of the Moon.

6. Waning Gibbous

As the Moon begins its journey back toward the Sun, the opposite side of the Moon now reflects the Moon’s light. 

7. Last Quarter

The Moon looks like it’s half illuminated from the perspective of Earth, but really you’re seeing half of the half of the Moon that’s illuminated by the Sun ― or a quarter. 

8. Waning Crescent

The Moon is nearly back to the point in its orbit where its dayside directly faces the Sun, and all that we see from our perspective is a thin curve. 

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{ https://www.dailymail.co.uk/sciencetech/index.html }

15-09-2025 om 20:38 geschreven door peter  

The Impact Event that Shaped Earth’s History: An In-Depth Scientific Analysis of the 35-Million-Year-Old Asteroid Collision

Introduction

Throughout Earth's complex geological history, extraterrestrial impacts have played a significant role in shaping the planet’s surface, climate, and biological evolution. Among these, asteroid impacts stand out due to their catastrophic potential and their ability to produce profound, sometimes global-scale effects. Approximately 35 million years ago, a colossal asteroid struck the eastern coast of what is today North America, leaving behind one of Earth's largest and best-preserved impact craters beneath Chesapeake Bay. This event not only caused immediate destruction but also triggered a series of subsequent catastrophic phenomena, including massive tsunamis and environmental upheaval. Recent research has provided new insights into this ancient impact, revealing the event's true scale and its far-reaching consequences. This comprehensive analysis aims to detail the geological evidence, reconstruct the sequence of events, and explore the implications of this impact for Earth's history, drawing from recent scientific findings published in the journal Southeastern Geology.

A 5-kilometer asteroid caused two devastating planetary-scale catastrophes 35 million years ago.
Illustrative photo: SciTechDaily

The Asteroid: Dimensions, Velocity, and Impact Site

The impactor was approximately 5 kilometers in diameter, a size capable of releasing an enormous amount of energy upon collision. Traveling at velocities exceeding 64,000 km/h (about 17.8 km/s), the asteroid imparted an immense kinetic energy, estimated at roughly 10^24 joules—comparable to billions of nuclear bombs detonating simultaneously. Such an energy release would have instantaneously vaporized a vast area, generated shock waves propagating through Earth’s crust, and initiated global environmental disturbances.

The impact site was in what is now Chesapeake Bay, Virginia, a region characterized by sedimentary deposits accumulated over millions of years. The collision created a transient crater that, over geological time, was buried beneath sediment and oceanic deposits, resulting in the present-day impact structure lying approximately 500 meters below the current ocean floor. This buried crater remains one of the best-preserved terrestrial impact structures, providing a unique window into the processes and consequences of asteroid impacts.

Geological Evidence of the Impact

Recent geological studies, notably those published in Southeastern Geology, have uncovered compelling evidence of the impact event far from the crater itself. Notably, fossils and rock layers discovered in Moore County, North Carolina—approximately 386 km southwest of the impact site—serve as a crucial record of the event's global influence. The identification and analysis of these layers have significantly advanced our understanding of the impact’s scale and consequence.

An asteroid struck the East Coast of North America 35 million years ago. Ejected material from the impact site was distributed over an area of at least four million square miles. Researchers have found clear traces of the impact and dated them for the first time using the uranium-thorium-helium technique. ODP 1073 on the map refers to the ocean drilling project site where the sample material for this study was collected.
Credit: GEBCO world map 2014, www.gebco.net

Layered Sedimentary Record

Central to this research is a nearly one-meter-thick stratigraphic sequence containing four distinct layers, each representing different phases of the impact aftermath:

1. Bottom Layer (43 cm thick): This layer is rich in sandy clay, carbon glass (also known as tektites), and rock fragments. The presence of iridium at concentrations up to 18 parts per billion (ppb)—a hallmark of extraterrestrial material—provides unequivocal evidence that this layer originated from an extraterrestrial impact. Iridium is rare on Earth's crust but abundant in meteorites, making its presence a key indicator of cosmic origin.

2. Second Layer (9 cm thick): Comprising silt and loosely bound quartz and carbon fragments with reduced iridium levels, this layer signifies the dispersal of smaller impact ejecta as the initial shock wave dispersed material into the atmosphere and surrounding environment.

3. Third Layer (6 cm thick): Consisting of a mixture of marine sediments and seabed fragments, this layer indicates subsequent geological processes, particularly water filling the crater and triggering massive landslides of marine sediments into the impact basin.

4. Fourth Layer (15 cm thick): Composed of coarse sand and gravel, this uppermost layer bears the signature of a powerful tsunami wave depositing large sediments over the existing layers.

The stratigraphy offers a comprehensive timeline of the impact event, detailing the progression from the initial collision to subsequent environmental changes. Each layer reflects a distinct phase, revealing insights into the destructive processes and their global effects. Understanding this sequence helps scientists piece together the event’s magnitude and consequences, providing valuable context for Earth's geological history and impact assessment.

1. Impact and Shock Wave Generation

 The collision of the asteroid with Earth's surface instantly generated an intense hypersonic shock wave that propagated rapidly through the crust. This energy release caused widespread destruction within hundreds of kilometers, obliterating everything in its path, including flora, fauna, and geological formations. The shock wave also led to the melting and vaporization of rocks, producing molten debris that was ejected high into the atmosphere. The immense pressure and heat created a transient but powerful zone of devastation, marking the beginning of the catastrophic sequence. This phase is critical because it set the stage for subsequent environmental upheavals, and the physical evidence of shock deformation in minerals confirms the immense energy involved.

2. Ejection and Atmospheric Dispersal

Within minutes of impact, a layer rich in impact ejecta, such as tektites and iridium-bearing material, was deposited across a vast area. These materials settle over regions as distant as Massachusetts and Barbados, demonstrating the event's enormous dispersal capacity. The presence of iridium, a rare extraterrestrial element, confirms the asteroid's origin. This layer provides a precise marker for dating the impact event, serving as a key stratigraphic reference point. The dispersal of molten and shattered debris not only signifies the initial energy release but also indicates the widespread atmospheric circulation that transported these materials globally. The distribution pattern reflects the impact's immense force and the Earth's atmospheric dynamics during the event.

3. Dispersal of Fine Particulates and Cloud Formation

Following the initial ejecta, a fine particulate cloud formed from pulverized rock and debris dispersed into the atmosphere. This cloud caused a significant reduction in sunlight reaching Earth's surface, leading to what is often described as an impact winter. The diminished sunlight likely caused short-term global cooling, disrupting photosynthesis and affecting ecosystems worldwide. This environmental upheaval could have contributed to the mass extinction of species, especially those sensitive to climate change. The stratigraphic record of this phase includes layers of soot and ash, indicating widespread fires and atmospheric particulates. This phase underscores how an impact event can trigger climate shifts, with short-term but profound effects on life. 

4. Crater Filling and Landslides

As water flooded the impact crater, the unstable sediments surrounding the site became prone to destabilization. Massive landslides of marine sediments cascaded into the basin, filling the crater with a mixture of soil and seabed fragments. This process signifies a transition from a primarily impact-driven environment to a water-dominated one, altering local geology dramatically. The resulting layer contains evidence of sediment reworking, including disturbed strata and displaced marine fossils. This phase reflects the ongoing geological response to the impact, highlighting how secondary processes like flooding and landslides shape the stratigraphic record. It also indicates the importance of water in modulating the impact's environmental impact.

5. Tsunami Generation and Sediment Deposition

The final, most destructive phase involved the generation of a colossal tsunami triggered by the sudden displacement of water due to the impact and crater infilling. The tsunami propagated across the Atlantic Ocean, inundating coastal regions with high-energy waves. This resulted in the deposition of coarse sediments, such as gravel and sand, over large areas, including Moore County. The uppermost stratigraphic layer records this event, characterized by high-energy deposits indicative of tsunami action. The deposits include chaotic, poorly sorted sediments with marine fossils embedded within them, evidence of rapid, forceful inundation. This phase demonstrates the global reach of impact-induced phenomena and their capacity to reshape coastlines and sedimentary environments dramatically.

A microscopic photograph of tiny silica droplets, formed by an asteroid impact.

Credit: Natalie Cheng / Bridget Weed.

Environmental and Biological Consequences

The immediate aftermath of the impact was utterly catastrophic, unleashing a series of devastating environmental effects that reshaped Earth's ecosystems. The colossal shock wave generated by the impact would have propagated across vast distances, exerting immense pressure on both terrestrial and marine life forms. Simultaneously, the intense thermal energy released during the collision caused widespread vaporization of rocks and minerals, creating a colossal plume of superheated debris that was rapidly dispersed into the atmosphere. This atmospheric dispersal of particulate matter and aerosols would have triggered a temporary but severe "impact winter," dramatically reducing sunlight penetration to Earth's surface. The resulting drop in temperatures and suppression of photosynthesis would have led to mass extinction events among many plant species and the animals dependent on them, disrupting entire food chains and ecological networks.

The climatic perturbations caused by these events likely persisted for several years, or even decades, profoundly influencing evolutionary pathways. The prolonged darkness and cold conditions would have favored the survival of species capable of enduring harsh environments, thus driving selective pressures that shaped future biodiversity. The impact's influence on climate and ecosystems could have facilitated the emergence of new adaptive traits among surviving species, setting the stage for subsequent evolutionary diversification.

In addition to atmospheric and climate effects, the impact would have generated enormous tsunami waves that radiated outward from the site of impact, inundating coastal regions and reshaping shorelines. These massive waves would have caused widespread flooding of low-lying areas, leading to the destruction of habitats and the displacement of countless organisms. The marine environment, in particular, would have undergone profound changes: sedimentation rates increased sharply due to the influx of debris, and habitats such as coral reefs and seabed communities faced destruction or significant alteration. These disruptions would have led to a decline in marine biodiversity and a reshuffling of marine ecosystems.

On land, the effects were equally severe. The intense heat and shockwaves sterilized large areas, destroying plant life and disrupting terrestrial habitats. Forests, grasslands, and other ecosystems faced massive die-offs, while soil erosion and habitat fragmentation further impeded recovery. The combined terrestrial and marine ecological upheavals resulted in a significant biotic turnover, particularly during the Miocene epoch, a period marked by notable evolutionary shifts and diversification among surviving species.

Overall, the impact's environmental and biological consequences were profound, triggering immediate mass extinctions, altering climate patterns, reshaping coastlines, and instigating long-term evolutionary changes. The aftermath set in motion a series of ecological shifts that would influence the course of life on Earth for millions of years to come, marking a pivotal point in Earth's geological and biological history.

Popigai in Siberia, the result of an asteroid strike 36 million years ago, is one of the largest and most well-preserved impact craters on Earth. 

(Image credit: NASA Earth Observatory/Joshua Stevens, using data from NASA/METI/AIST/Japan Space Systems and the US/Japan ASTER Science Team)

Implications for Earth's Geological and Biological Evolution

This impact event provides a compelling example of how extraterrestrial collisions have significantly influenced Earth's geological landscape as well as its biological history over millions of years. The evidence discovered in Moore County serves as a crucial piece in understanding the far-reaching effects that such catastrophes can have. Scientific investigations reveal that the physical and chemical signatures resulting from this impact are not confined to the immediate vicinity of the impact crater but can be detected hundreds of kilometers away. These signatures include shocked minerals, specific isotopic anomalies, and unique mineral formations such as shatter cones and tektites, which serve as telltale markers of large-scale impact events.

The timing of this impact correlates with a period of notable transition in Earth's biological and ecological systems during the Miocene epoch, approximately 15 to 10 million years ago. This era was characterized by significant shifts in flora and fauna, including the evolution and extinction of various species, as well as the expansion of grasslands and the diversification of mammals. The coincidence of this impact with such biological upheavals raises the possibility that extraterrestrial collisions may have played a role in accelerating or triggering these evolutionary changes. While it remains difficult to establish a direct causal relationship, this association underscores the importance of considering extraterrestrial influences as factors in Earth's complex evolutionary history.

In addition to its implications for understanding Earth's past, this impact event enhances our knowledge of planetary defense and risk assessment strategies for the future. By studying the physical evidence and the sequence of events surrounding ancient impacts, scientists can better recognize the signatures of similar events that might occur again. This knowledge enables the development of more accurate models of impact frequency, size, and potential consequences—such as widespread environmental disruption, climate change, and mass extinctions. Furthermore, understanding the long-term geological and biological effects of past impacts informs the creation of mitigation strategies, including asteroid detection programs and deflection technologies, aimed at preventing or minimizing the damage caused by future celestial collisions.

Overall, this impact event exemplifies the profound influence extraterrestrial collisions can have on shaping Earth's surface features and biological diversity. It highlights the importance of continued research into impact geology, planetary defense, and Earth's evolutionary history to better understand our planet's past and to safeguard its future.

(Data courtesy of the Republic of Guinea and TGS) (a) regional map showing the location of the Nadir Crater on the Guinea Plateau, offshore West Africa. Other important seabed features are also highlighted, including the Nadir Seamount after which the crater is named. (b and c): regional seismic cross sections across the Guinea Plateau, showing the age of the sedimentary units across the plateau and the location of the Nadir Crater and Nadir Seamount.

Conclusion

The asteroid impact approximately 35 million years ago near present-day Chesapeake Bay represents a pivotal event in Earth's geological history, with profound and lasting effects on the planet's surface, climate, and biosphere. The recent discovery of detailed stratigraphic layers in Moore County has provided invaluable insight into the sequence of events that followed the impact. These layers reveal a complex interplay of immediate shock wave destruction, widespread wildfires, and the formation of a massive tsunami, which collectively reshaped the landscape and influenced the environment for millions of years thereafter. The irrefutable evidence of extraterrestrial origin, including shocked mineral grains and impact ejecta, emphasizes the importance of understanding cosmic influences on Earth’s history.

Studying such impact events is crucial for several reasons. Firstly, it enhances our comprehension of Earth's geological and biological evolution, shedding light on how catastrophic events have contributed to mass extinctions and subsequent recovery periods. Additionally, these findings help us recognize patterns and frequencies of large asteroid impacts, which is essential for assessing future risks. As the Earth continues its orbit through a universe teeming with potential hazards, ongoing research into past impacts serves as a vital tool in planetary defense strategies.

Furthermore, understanding the aftermath of such impacts can inform us about the resilience and adaptability of life, offering lessons on survival and recovery following global catastrophes. The knowledge gained not only satisfies scientific curiosity but also has practical implications for preparing for future impact threats. As technology advances, our ability to detect and potentially mitigate such events improves, emphasizing the importance of continued research and international cooperation in planetary defense efforts.

In conclusion, the study of the Chesapeake Bay impact event and similar occurrences underscores the dynamic and interconnected nature of Earth's history and its cosmic environment. These investigations deepen our appreciation of Earth's vulnerability and resilience while guiding us toward better preparedness for possible future cosmic encounters. Ultimately, understanding Earth's impact record enriches our knowledge of planetary evolution and supports the ongoing quest to safeguard our planet for future generations.

{ PETER2011 }

15-09-2025 om 17:57 geschreven door peter  

Perseverance Finds Potential Chemical Signatures of Ancient Microbial Life on Mars

Introduction

The quest to discover past life on Mars has long captivated scientists and the public alike. With NASA’s Perseverance rover exploring the Jezero Crater, a site believed to have once hosted a lake, researchers are uncovering intriguing evidence that may point to ancient microbial life. A recent publication in Nature details the extensive geological, petrographic, and geochemical investigations conducted by the rover’s suite of instruments, revealing potential biosignatures in rocks of the Bright Angel formation. This article delves into these findings, their significance, and the broader implications for understanding Mars’ ancient habitability.

This artist’s impression shows how Mars may have looked about 4 billion years ago.

Image credit: M. Kornmesser / ESO.

The Geological Context of Jezero Crater

• Jezero Crater as a Window into Mars’ Past

Jezero Crater, approximately 45 kilometers in diameter, was once a lake-rich environment that preserved a diverse array of sedimentary deposits. Its geological makeup offers a unique record of Mars' early climate and potential habitability. The crater’s deposits include mudstones and conglomerates indicative of flowing water and standing lakes, making it an ideal site to search for biosignatures. These sediments have the potential to contain organic molecules and microfossils, providing crucial clues about past life possibilities on Mars. The stratigraphy within Jezero reveals multiple episodes of water activity, including lake formation and sedimentation, which are essential for understanding the planet's climatic evolution. Moreover, the mineralogical composition of these deposits, such as clay minerals and carbonates, further supports the evidence of a once warmer and wetter environment. Studying these geological features helps scientists reconstruct Mars’ climatic history and assess its habitability during the Noachian period, approximately 3.8 to 4.1 billion years ago

Image showing the area of Jezero Crater explored by the Perseverance rover.

Credit: ESA/DLR/FU Berlin

• Bright Angel Formation: A Sedimentary Archive

Within Jezero, the Bright Angel formation comprises sedimentary rocks deposited by aqueous processes. These include fine-grained mudstones, layered beds, and conglomerates. Such rocks form in environments where water interacts with sediments over extended periods, often creating conditions conducive to the preservation of organic molecules and mineralogical signs of biological activity. The layered nature of the Bright Angel formation suggests repeated cycles of sedimentation, possibly related to lake level changes or seasonal variations. The presence of clay minerals within these sediments indicates neutral to slightly alkaline conditions, favorable for preserving organic compounds. Additionally, the conglomerates contain rounded pebbles and cobbles that reveal information about water flow velocities and sediment transport mechanisms. The detailed analysis of these rocks by Perseverance provides insights into the environmental conditions that prevailed during sediment deposition, including water chemistry, temperature, and duration of aqueous episodes. These findings are vital in understanding the habitability potential of Jezero’s past environments and guiding future exploration efforts.

• Exploration of Neretva Vallis

Perseverance’s entry into Neretva Vallis, on the western edge of Jezero, allowed the rover to investigate distinctive outcrops of the Bright Angel formation. The rover’s detailed analyses of these rocks have yielded key insights into their composition and formation history. By examining the mineralogy and texture of the outcrops, scientists have identified signatures of aqueous alteration, such as clay minerals and sulfates, which indicate past interactions with water. The morphology of the outcrops reveals layered structures that suggest episodic sedimentation, possibly during different lake stages or flood events. These observations help reconstruct the paleoenvironmental conditions, including water chemistry, pH, and redox states. Furthermore, the geochemical data obtained from Neretva Vallis outcrops have provided evidence for mineral stabilization processes that may have contributed to the preservation of potential biosignatures. The exploration of this area continues to refine our understanding of Mars’ aqueous history and enhances the search for signs of ancient life in Jezero Crater.

This artist’s concept depicts NASA’s Mars rover Perseverance on the surface of the Red Planet.

Image credit: NASA / JPL-Caltech.

Instrumentation and Methodology

• Perseverance’s Suite of Scientific Instruments

The rover is equipped with a comprehensive array of scientific tools designed for detailed analysis of the Martian surface. In addition to SHERLOC and PIXL, it features the SuperCam, which combines laser-induced breakdown spectroscopy (LIBS), Raman spectroscopy, and visible/near-infrared (VNIR) spectroscopy, enabling remote mineral identification and organic detection from a distance. The Mastcam-Z camera system provides high-resolution panoramic and stereoscopic imaging for geological context and terrain mapping. The Sample Caching System allows for the collection, sealing, and storage of promising samples for future retrieval and return missions. The MEDA (Mars Environmental Dynamics Analyzer) monitors atmospheric conditions, temperature, humidity, and dust levels, providing essential environmental data to support the interpretation of geological findings.

• Analytical Techniques
  • Spectroscopy: SHERLOC and PIXL provide mineralogical and molecular signatures, including Raman spectra indicative of organic carbon.The suite employs multiple spectroscopic methods, including Raman, LIBS, and X-ray fluorescence, to determine mineral compositions and detect organic compounds. These techniques identify chemical signatures indicative of past habitability and potential biosignatures.
  • Imaging: The high-resolution cameras capture detailed images of rock textures, layering, and mineral veins, revealing geological history and processes. Imaging also helps select optimal sample sites for drilling and analysis.
  • Sample Collection: Perseverance drilled into rocks to collect core samples, such as from Sapphire Canyon, which are stored securely in sealed tubes. These samples are preserved for detailed laboratory analysis upon return to Earth, enabling future detailed studies of Martian geology and potential biosignatures. A core sample named Sapphire Canyon was obtained from the Bright Angel formation and stored in a sealed tube for potential future return to Earth.

Composite image showing some of the sample tubes deposited by the Perseverance rover at 'Three Forks,” a location within Mars’s Jezero Crater.

Credit: NASA JPL-Caltech

Some of the features of Chevaya Falls.

(NASA/JPL-Caltech/MSSS)

Key Geological and Geochemical Findings

• Detection of Organic Molecules and Redox-Active Minerals

The analytical instruments identified diverse organic molecules—carbon-based compounds—embedded within the rock matrices. These organics include complex hydrocarbons and functionalized carbon compounds that suggest the past presence of biological activity or prebiotic chemistry. Alongside these, minerals such as vivianite (ferrous iron phosphate) and greigite (iron sulfide) were detected. These minerals are indicative of low-temperature, aqueous environments, often forming in conditions that support microbial life. Their presence implies that water-rock interactions played a crucial role in the mineralization process and potentially served as habitats for microbial ecosystems. The redox-active nature of these minerals suggests a dynamic environment where oxidation-reduction reactions could facilitate energy transfer, possibly supporting microbial metabolisms similar to those on early Earth. These findings point toward a past environment conducive to life, characterized by the availability of liquid water, chemical energy sources, and organic building blocks. The coexistence of organics and redox minerals strengthens the hypothesis that these rocks experienced biogeochemical processes, offering valuable insights into the planet’s potential habitability during its geological history.

• Structural Features: ‘Poppy Seeds’ and ‘Leopard Spots’

Microscopic imaging revealed distinctive textures within the rocks, notably tiny nodules called 'poppy seeds' and reaction fronts known as 'leopard spots.' The 'poppy seeds' are small, spherical inclusions enriched in ferrous iron phosphate, which suggest localized mineralization possibly driven by biological or chemical processes. The 'leopard spots' display mottled patterns of mineral alteration, often associated with zones of redox change. These features are significant because they are typically formed through redox reactions involving electron transfer, processes often mediated by microbial activity. Their spatial distribution and mineralogy imply that microbial communities might have influenced mineral deposition and alteration, leaving biosignatures embedded within the rock fabric. Such features serve as microscopic indicators of past biological processes and environments. Their study provides clues about the extent and nature of microbial life in ancient aqueous systems, contributing to our understanding of extraterrestrial habitability.

• Organic Signatures and the G-Band

The SHERLOC instrument detected a prominent Raman spectral feature known as the G-band within multiple Bright Angel rocks. The G-band, centered around 1580 cm^-1, is a diagnostic marker of graphitic or amorphous organic carbon. Its presence indicates that organic molecules are not only present but have undergone some degree of carbonization or graphitization, processes associated with biological activity or diagenetic alteration. The strongest G-band signals were observed at Apollo Temple, correlating with a mineral assemblage rich in carbonaceous material and redox-sensitive minerals. The detection of the G-band provides compelling evidence for the past existence of organic matter, which could have originated from biological sources or abiotic synthesis pathways. The spatial distribution of the G-band, alongside mineralogy, helps reconstruct potential environments where organics were preserved—such as low-temperature, water-rich settings that favor organic stability. These findings bolster the case for ancient habitable environments and highlight the importance of organic preservation in the geological record, both on Mars and in astrobiological research.

Interpreting the Geological and Chemical Evidence

• Redox Reactions and Microbial Metabolisms

The spatial association of organic molecules with redox-sensitive minerals suggests that chemical processes similar to microbial metabolisms on Earth could have occurred on Mars. On Earth, microbes metabolize organic matter by "breathing" iron and sulfate, leading to mineral formation. The presence of these features on Mars raises the tantalizing possibility that similar processes took place.

• Abiotic versus Biotic Origins

The findings prompt two main hypotheses:

1. Abiotic (Geochemical) Processes: The mineral structures and organic signatures could result from purely chemical reactions driven by environmental conditions, such as water chemistry, temperature, and mineral interactions, without biological intervention.

2. Biological Influence: Alternatively, microbial activity could have influenced mineral formation, with microbes metabolizing organic molecules and mediating redox reactions, leaving behind biosignatures.

• Constraints on Temperature and Formation Conditions

One critical aspect is the temperature history of these rocks. Many mineral features associated with microbial processes on Earth only form at relatively low temperatures. The analysis suggests that the rocks were never subjected to high-temperature heating, which would have obliterated delicate biosignatures. This supports the hypothesis that if life existed, it could have thrived in the aqueous environments represented by these rocks.

Perseverance’s path through Neretva Vallis and views of the Bright Angel formation.

Image credit: Hurowitz et al., doi: 10.1038/s41586-025-09413-0.

Implications for Past Life on Mars

• Potential Biosignatures and Their Significance

While the evidence remains inconclusive as definitive proof of past life, the observed features align with NASA’s criteria for potential biosignatures—molecular or mineralogical indicators that suggest biological activity in the planet's history. The co-occurrence of organic molecules with minerals formed in water-rich, redox-active environments is particularly noteworthy, as it points to conditions that could have supported microbial life. These signatures, especially when found in specific mineral matrices, increase the likelihood that biological processes may have contributed to their formation. Understanding these biosignatures enhances our knowledge of Mars’ ancient habitability and guides future exploratory missions. Further laboratory analysis will be crucial to determine whether these features originated biologically or through abiotic processes, helping to refine our criteria for detecting life beyond Earth.

• Comparison with Terrestrial Analogues

 On Earth, similar mineral-organic associations are prevalent in ancient sedimentary deposits where microbial communities thrived under comparable environmental conditions. For example, iron-rich banded iron formations and sulfur-rich sediments often host microfossils and biogenic mineral structures. These terrestrial analogues demonstrate how microbial metabolisms can influence mineral precipitation and organic preservation over geological timescales. The parallels suggest that if life ever existed on Mars, it might have employed similar metabolic pathways, particularly involving iron and sulfur cycling, which are abundant in the planet's ancient crust. Studying Earth's early ecosystems provides valuable insights into the potential biological processes that could have operated on Mars, informing the search for life and interpreting potential biosignatures.

• Sample Return and Future Research

 The core sample from Sapphire Canyon is carefully stored for eventual return to Earth, marking a significant milestone in planetary exploration. Once retrieved, comprehensive analyses in terrestrial laboratories will enable high-precision isotopic studies to determine biogenic versus abiotic origins of the detected features. Advanced techniques such as microfossil identification, mineralogical characterization, and molecular analysis will be employed, surpassing the capabilities of rover-based instruments. These investigations aim to confirm whether the observed features are indeed the result of past biological activity or are products of non-biological processes. Such definitive evidence would profoundly impact our understanding of Mars’ history and its potential to have harbored life. Moreover, the findings will guide future missions, refining biosignature detection strategies and expanding our search for extraterrestrial life elsewhere in the universe. 

Broader Scientific and Astrobiological Context

• Understanding Mars’ Habitability

The findings reinforce the idea that early Mars had environments suitable for life: persistent liquid water, chemically rich sediments, and energy sources. The presence of organic molecules and microbial-like mineral signatures suggests that habitable conditions may have persisted long enough for microbial communities to develop. These conditions provide a compelling case for Mars being a potentially life-supporting environment in its past. The detection of water-related minerals, such as clays and sulfates, indicates that Mars experienced prolonged aqueous activity, which is essential for the emergence and sustenance of life. Moreover, the chemical richness of sediments points to the availability of nutrients necessary for microbial metabolism. The energy sources, possibly derived from volcanic activity or chemical gradients, could have powered biological processes. Understanding these factors helps scientists reconstruct the planet’s ancient climate and assess its capacity to harbor life, guiding future exploration efforts to identify specific sites with the highest potential for biosignatures. Such insights are crucial in establishing Mars’ role in the broader narrative of life's origins in the universe and assessing the planet’s potential as a future habitat for human exploration. 

NASA's Perseverance rover captured this selfie on 23 July 2024, near a rock known as Cheyava Falls, which shows evidence that it may have once been home to microbial life.

Credit: NASA/JPL-Caltech/MSSS

• Astrobiological Significance

Discovering potential biosignatures on Mars has profound implications for understanding the universality of life. If microbial processes can form mineral-Organic associations in Martian environments, it broadens the scope of where life could exist or have existed elsewhere in the universe. These findings suggest that life may not be confined to Earth-like conditions but could potentially thrive in a variety of extraterrestrial settings. The detection of organic molecules, combined with mineral signatures indicative of biological activity, supports the hypothesis that life’s building blocks are widespread and that similar processes might occur on other planetary bodies, such as Europa or Enceladus. This expands the astrobiological search beyond traditional habitable zones, encouraging scientists to explore diverse environments that may harbor life. Additionally, understanding how biosignatures form and are preserved on Mars provides critical insights into the longevity and detectability of extraterrestrial life signals. These discoveries fuel the scientific quest to answer whether life exists beyond Earth, shaping future missions aimed at detecting definitive signs of past or present life on other planets and moons.

• Challenges and Limitations

Despite the excitement, scientists emphasize caution. The features observed could result from non-biological processes, such as mineralization, chemical reactions, or abiotic mineral formation. Differentiating between biological and abiotic origins of potential biosignatures remains a significant challenge, requiring rigorous analysis and multiple lines of evidence. Definitive proof of past life necessitates unambiguous biosignatures, such as microfossils—tiny, cell-like structures—or isotopic ratios characteristic of biological activity, which are difficult to confirm remotely. Contamination, preservation biases, and the complexity of planetary geology complicate interpretations. Future sample analyses, potentially conducted on return missions, are expected to provide more conclusive evidence. They aim to identify complex organic molecules, specific microscopic structures, and isotopic signatures that can only be attributed to biological processes. Until then, findings remain promising but provisional, emphasizing the importance of cautious scientific interpretation. These limitations highlight the need for advanced instrumentation, meticulous data collection, and comprehensive analysis to confidently establish whether life once existed—or still exists—on Mars.

Concluding Remarks

The Perseverance rover’s exploration of the Bright Angel formation has provided compelling evidence that ancient Martian environments could have supported microbial life. The detection of complex organic molecules is particularly significant, as these are fundamental building blocks of life. Additionally, the identification of minerals such as clay and sulfates—known to form in the presence of water—indicates that Mars once had a habitable environment with the necessary conditions for microbial life to thrive. Structural features observed within the rock formations resemble biosignatures, further strengthening the case for past life, although they are not definitive proof on their own.

These findings are crucial because they suggest that Mars's ancient environment was more hospitable than previously thought, potentially allowing microbial organisms to exist or have existed. The significance of these discoveries extends beyond Mars; they contribute to the broader search for life beyond Earth and inform future exploration strategies. The upcoming analysis of samples returned to Earth will be critical in verifying these initial findings.

Advanced laboratory techniques can detect subtle biosignatures that in-situ instruments cannot, offering the possibility of conclusive evidence of past life. Ultimately, these discoveries challenge our understanding of life's distribution in the universe, opening new avenues for scientific inquiry and existential reflection. Continued research is essential to fully unravel Mars’s ancient habitability and to answer one of humanity’s most profound questions: Are we alone?

{ PETER2011 }

14-09-2025 om 23:31 geschreven door peter  

Camera trap in Chile detects strange lights blazing through the wilderness. Researchers are scrambling to explain them.

Kusch is one of the leaders of the Public Baseline project, which uses 65 camera traps distributed between continental Patagonia and Tierra del Fuego, on the southern tip of Chile, to record terrestrial animals, particularly felines. Since the project began in November 2023, at least 365,000 images and videos have been collected; however, only these three photographs show this phenomenon.

UMAG shared the images with a variety of organizations, from Chile's General Directorate of Civil Aeronautics (SEFAA)to the La Serena UFO Museum, and to several people who analyze anomalous aerial phenomena.

Potential explanations ranged from an arachnid coming very close to the camera lens to that of a "plasmoid," a short-lived form of plasma rarely observed in nature that may be behind phenomena such as ball lightning. However, all specialists agreed: for now, there is no conclusive explanation.

This sighting is unique because it was recorded within the framework of a scientific project, said Rodrigo Bravo, a researcher with the Environmental Studies Group (GEA) at UMAG and a member of the Public Baseline project. That means there is no possibility of fraud or manipulation, as the camera traps operate under rigorous protocols and are equipped with an infrared system, motion sensor, and other features that would preclude people tampering with them, he argued.

"This is not the first time these phenomena have been described in the area, but it is the first time they have been recorded in this way," Bravo told Live Science.

Related: 

• No aliens in NASA's debut UFO report — but big questions remain

Bad lights

The local Mapuche people traditionally speak of "bad lights," which they believe are spirits that appear in the fields. This raises the possibility that the camera traps are finally capturing a phenomenon that has long been recognized in the region.

But even if these strange flashes are the "bad lights" the Mapuche speak of, what are they?

One possibility is that the lights are unidentified aerial phenomena (UAP), possibly from a mysterious flying object. Some declassified Pentagon files on UAP show similar characteristics, Bravo added. Generally poor-quality data means that most UAP sightings cannot be confirmed or explained, but common explanations include foreign spy drones and "airborne clutter" such as birds and weather balloons.

To address that possibility, UMAG sent photos and video to Freddy Alexis, who discusses UFOs and other unknown phenomena on his TV programs on UCVTV, the station of the Catholic University of Valparaíso.

Alexis wrote two reports on his findings, which included trajectory, spectrographic, and relief analyses of the photographs and videos. In the second report, he wrote that only a single "luminous stimulus" is visible, not two, and that the other "lights" are internal lens reflections.

According to Alexis, the primary light may be a plasmoid, or a bubble of incandescent ionized gas that is confined by Earth's local magnetic field, and that can remain stable for a few seconds. The most familiar atmospheric example is ball lightning, usually associated with storms. But that is where his explanation hits a wall. "It was summer, with 48  degrees Fahrenheit [8 degrees Celsius], and there were no electrical storms," Alexis told Live Science. "There were no atmospheric conditions for a storm, so it is very unlikely that ball lightning could have formed."

But more exotic plasmoids have been proposed under special conditions, such as transient, localized changes in Earth's magnetic field.

Still, Alexis noted that there may be other, poorly understood atmospheric plasmoids, similar to the "mysterious lights" of Hessdalen, Norway. Like the Magallanes phenomenon, these lights defy conventional explanations and could involve plasma structures that are still poorly understood.

In one of his reports, Alexis also calculated that, assuming this was a distant, flying object, it would have been moving at a speed of 590 mph (947 km/h), or roughly 0.7 times the speed of sound. Alexis suggested that the lights might not be a flying object, but some plasmoids can move at high speeds, he added.

A strange creature

In a separate report, technicians from La Serena UFO Museum suggested that a spider or moth may have inadvertently tripped the camera's sensor. That's because in the first photo, what appears to be an insect or arachnid can be seen along one edge of the image. However, the insect does not appear in the subsequent photos.

While one possibility is that the insect triggered the camera, this would only explain why the photo was taken, not why a bright, blob-like light appears, said

Cristian Riffo, director of the La Serena UFO Museum, who was also consulted for the UMAG report.

Riffo noted that the camera traps are designed to minimize false positives caused by insects, lasers or other stimuli. He thinks the rapid sequence of photos, in which the light appears to move toward the camera, is baffling and hard to explain.

"It could be two different phenomena: one natural, which triggered the camera, and the other, a light phenomenon, which remains unexplained," Riffo told Live Science.

{ https://www.universetoday.com/  }

12-09-2025 om 22:09 geschreven door peter  

3-4 billion years ago, Mars’ volcanoes spewed large amounts of sulfur-containing gases. And it was not sulfur oxide, as previously thought, but hydrogen sulfide and sulfur hexafluoride. These are much stronger greenhouse gases and could well have created a climate on the planet conducive to life.

Sulfur-containing gases and the early climate of Mars

Although the early climate of Mars remains an open question, new research suggests that its atmosphere may have been hospitable to life thanks to volcanic activity that released sulfur gases that contributed to the greenhouse effect.

Using data from the composition of Martian meteorites, researchers conducted more than 40 computer simulations with different temperatures, concentrations, and chemistry to estimate how much carbon, nitrogen, and sulfur gases could have been released on early Mars.

Instead of the high concentrations of sulfur dioxide (SO₂) predicted by previous climate models of Mars, their research shows that volcanic activity on Mars approximately 3-4 billion years ago could have led to high concentrations of several chemically “reduced” forms of sulfur, which are extremely reactive. These include hydrogen sulfide (H2S), disulfur (S2), and possibly sulfur hexafluoride (SF6), an extremely potent greenhouse gas.

According to lead author Lucia Bellino, a graduate student at the University of Texas at Jackson School of Geosciences, this could have led to a unique environment on Mars – one that could have been hospitable to certain forms of life. This means that the presence of “reduced sulfur” could have caused a foggy environment, leading to the formation of greenhouse gases such as SF6, which trap heat and liquid water. This could have created hydrothermal systems that support diverse microbial life.

The role of sulfur in the chemical processes of ancient Mars

Previous studies of Mars have examined how the release of gases on the surface, often as a result of volcanic eruptions, could have affected the planet’s atmosphere. This study, in turn, simulated how sulfur changed during geological processes, including how it separated from other minerals when incorporated into magma layers beneath the planet’s surface. This is important because it provides a more realistic picture of the chemical state of the gas before it was released onto the surface, where it could have shaped the early climate conditions on Mars.

The study also showed that sulfur may have frequently changed its form. While Martian meteorites have high concentrations of reduced sulfur, the Martian surface contains sulfur that is chemically bound to oxygen. “This suggests that sulfur cycling – the transition of sulfur into different forms – may have been a dominant process on early Mars,” Bellino said.

Last year, while the team was conducting its research, NASA made a discovery that seemed to confirm their findings. NASA’s Curiosity rover turned over and cracked a rock, revealing elemental sulfur. Although Mars is known for its abundance of sulfur minerals, this was the first time the mineral had been found in its pure form, unbound to oxygen. This was one of the confirmations of the research team’s hypotheses.

Further climate modeling

As the team continues its work, it will use its computer simulations to investigate other processes that would have been necessary to support life on Mars, including sources of water on early Mars and whether volcanic activity could have provided a large reservoir of water on the planet’s surface. They also seek to understand whether reduced forms of sulfur could have served as a food source for microbes in an early climate that resembled Earth’s hydrothermal systems.

Mars is far from the Sun, and today its temperature is typically cold, averaging -80°F. Bellino hopes that climate modeling experts will be able to use her team’s research to predict how warm the early Martian climate might have been, and if microbes were present, how long they could have survived in a warmer atmosphere.

• Provided by: phys.org

• Posted in News, Science

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{ https://universemagazine.com/en/articles-en/ }

12-09-2025 om 21:54 geschreven door peter  

3-4 billion years ago, Mars’ volcanoes spewed large amounts of sulfur-containing gases. And it was not sulfur oxide, as previously thought, but hydrogen sulfide and sulfur hexafluoride. These are much stronger greenhouse gases and could well have created a climate on the planet conducive to life.

Sulfur-containing gases and the early climate of Mars

Although the early climate of Mars remains an open question, new research suggests that its atmosphere may have been hospitable to life thanks to volcanic activity that released sulfur gases that contributed to the greenhouse effect.

Using data from the composition of Martian meteorites, researchers conducted more than 40 computer simulations with different temperatures, concentrations, and chemistry to estimate how much carbon, nitrogen, and sulfur gases could have been released on early Mars.

Instead of the high concentrations of sulfur dioxide (SO₂) predicted by previous climate models of Mars, their research shows that volcanic activity on Mars approximately 3-4 billion years ago could have led to high concentrations of several chemically “reduced” forms of sulfur, which are extremely reactive. These include hydrogen sulfide (H2S), disulfur (S2), and possibly sulfur hexafluoride (SF6), an extremely potent greenhouse gas.

According to lead author Lucia Bellino, a graduate student at the University of Texas at Jackson School of Geosciences, this could have led to a unique environment on Mars – one that could have been hospitable to certain forms of life. This means that the presence of “reduced sulfur” could have caused a foggy environment, leading to the formation of greenhouse gases such as SF6, which trap heat and liquid water. This could have created hydrothermal systems that support diverse microbial life.

The role of sulfur in the chemical processes of ancient Mars

Previous studies of Mars have examined how the release of gases on the surface, often as a result of volcanic eruptions, could have affected the planet’s atmosphere. This study, in turn, simulated how sulfur changed during geological processes, including how it separated from other minerals when incorporated into magma layers beneath the planet’s surface. This is important because it provides a more realistic picture of the chemical state of the gas before it was released onto the surface, where it could have shaped the early climate conditions on Mars.

The study also showed that sulfur may have frequently changed its form. While Martian meteorites have high concentrations of reduced sulfur, the Martian surface contains sulfur that is chemically bound to oxygen. “This suggests that sulfur cycling – the transition of sulfur into different forms – may have been a dominant process on early Mars,” Bellino said.

Last year, while the team was conducting its research, NASA made a discovery that seemed to confirm their findings. NASA’s Curiosity rover turned over and cracked a rock, revealing elemental sulfur. Although Mars is known for its abundance of sulfur minerals, this was the first time the mineral had been found in its pure form, unbound to oxygen. This was one of the confirmations of the research team’s hypotheses.

Further climate modeling

As the team continues its work, it will use its computer simulations to investigate other processes that would have been necessary to support life on Mars, including sources of water on early Mars and whether volcanic activity could have provided a large reservoir of water on the planet’s surface. They also seek to understand whether reduced forms of sulfur could have served as a food source for microbes in an early climate that resembled Earth’s hydrothermal systems.

Mars is far from the Sun, and today its temperature is typically cold, averaging -80°F. Bellino hopes that climate modeling experts will be able to use her team’s research to predict how warm the early Martian climate might have been, and if microbes were present, how long they could have survived in a warmer atmosphere.

• Provided by: phys.org

• Posted in News, Science

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{ https://universemagazine.com/en/articles-en/ }

12-09-2025 om 21:54 geschreven door peter  

Scientists reveal exactly what will happen if the Earth continues to spin faster - including devastating earthquakes and catastrophic flooding

• READ MORE: Experts blame climate change for the record–breaking summer

By JONATHAN CHADWICK, ASSISTANT SCIENCE & TECHNOLOGY EDITOR 

You may already feel as if there’s not enough time in the day. 

But it's not just your imagination – the days have been getting shorter. 

According to scientists, July 9, July 22 and August 5 this year were between 1.3 and 1.51 milliseconds shorter than the standard 24-hour day. 

Although the exact reason is still a mystery, there could be several causes, such as changes in the atmosphere, the melting of glaciers, motion in the Earth's core, and a weakening magnetic field.

While the loss of a few milliseconds is not a cause for too much concern, a frightening new book imagines a world literally 'spinning out of control'.

In 'Circular Motion' by Alex Foster, days on Earth last 23 hours, then 20 hours, and then eventually two hours.

Like a supercharged spinning top, the planet spins so fast that even gravity loses its grip, as the sun rises and sets ever faster. 

Now, experts reveal the real implications of such a terrifying scenario, from large-scale disasters, floods and earthquakes. 

A new novel called 'Circular Motion' by Alex Foster imagines a world literally spinning out of control, until a day last just two hours 

In Foster's new novel, Earth's rotation speeds up due to a network of massive aircraft that orbit the Earth at 30,000 feet, revolutionising global transportation. 

The acceleration of Earth’s spin begins gradually, and days are just a few seconds shorter than normal, so nobody initially notices. 

However, Earth’s spin progressively gets faster and faster until a day lasts just two hours – triggering a global catastrophe. 

If Earth's spin really did get faster, experts say it cause a 'centrifugal effect' where the things start to swing away from the planet's axis, much like the hanging chairs on a spinning carousel ride.

Earth's oceans would start to bulge around the equator, giving the planet more of a diamond shape, with sloping northern and southern hemispheres. 

Water pulled from the polar regions (where centrifugal force is low) would cause the Arctic Ocean to become shallower and send the equatorial region underwater. 

Even land around the equator that's not underwater could have a greatly increased chance of tsunamis and flooding. 

Duncan Agnew, professor of geophysics at the University of California San Diego, said the 'largest changes would be in the ocean tides'. 

This long-exposure photo of the northern night sky above the Nepali Himalayas shows the apparent paths of the stars as Earth rotates. If Earth spun fast enough, is this what we would see?

According to scientists, July 9, July 22 and August 5 this year were between 1.3 and 1.51 milliseconds shorter than the standard 24-hour day . Although the exact reason is still a mystery, there could be several causes, such as changes in the atmosphere, the melting of glaciers, motion in the Earth's core, and a weakening magnetic field (stock image)

As any beach-goer knows, in coastal areas around the world there are high tides and low tides, which are due to the gravitational pull of the moon and the sun, combined with the rotation of Earth.  

The daily rotation of the Earth produces two high tides and two low tides every 24 hours and 50 minutes. 

'Change that by 10 per cent and the tides in some places would get larger and in others smaller,' Professor Agnew told the Daily Mail. 

Also, the faster the Earth's spin, the faster tectonic plates would move, would could add to more geological stress and 'a lot of earthquakes', the academic added. 

It’s worth remembering that the equator (where Earth’s circumference is the widest) spins faster than elsewhere, such as the tropics or the poles. 

The equator spins at about 1,025 miles (1,650km) per hour, while the poles spin barely above zero miles per hour. 

As Earth spins and we go around with it, we are held into place by gravity, but if the Earth spun fast enough, centrifugal force would overcome gravity, causing objects to be flung into space. 

'The faster Earth turns, the more gravity will be canceled out and the lighter you’ll feel,' said Foster in a piece for New Scientist. 

Hurricanes will spin faster and carry more energy if the world's spin greatly increases, researchers claim. In this picture from space, a swirling hurricane forms

The faster Earth's spin, the faster tectonic plates would move, would could add to more geological stress and 'a lot of earthquakes'. Pictured, damage from Afghanistan earthquake, September 4, 2025

NASA astronomer Dr Sten Odenwald also warned that weather phenomena would become more extreme, capable of causing more damage. 

As the planet spins faster, an apparent force known as the Coriolis effect, which gives hurricanes their spin, intensifies. 

'Hurricanes will spin faster and carry more energy,' Dr Odenwald said.

If Earth’s spin increased, there would of course also be both less sunlight in the day and less time to sleep at night, which might make humans less productive. 

People would have keep putting their clocks back as the days shortened, or come up with a whole new time-keeping system.

Humans have a 'circadian rhythm' – an internal clock that is closely attuned to the 24-hour day – which can cause physical and mental issues if disrupted (by factors like plane travel).

Additionally, many satellites would no longer be positioned correctly, which could disrupt satellite communications, internet, TV broadcasting and more.

Luckily, Professor Agnew said the idea of Earth's rotation speeding up to the extent portrayed in the new novel is a 'particularly absurd premise'. 

Each day on Earth contains 86,400 seconds, but the rotation isn't uniform, which means over the course of a year, each day has a fraction of a second more or less

'This cannot happen and nothing like it has ever been observed for any planet or star,' Professor Agnew told the Daily Mail. 

In actual fact, the Earth has been rotating more and more slowly over the long-term, but this change has been very gradual.

'A billion years ago the day was maybe 19 hours long,' he told the Daily Mail. 

'If you went back to when there were dinosaurs and didn't have a clock you wouldn't probably notice that the day was 30 minutes shorter.' 

Dr Judah Levine, Fellow of the US government's National Institute of Standards and Technology (NIST) in Maryland, also questioned how close the book's premise is to 'real physics'. 

'If the story is loosely connected to reality, then the speed-up of Earth had to be accompanied by something else losing angular momentum, maybe the orbit of the moon,' he told the Daily Mail. 

'This is a fundamental principle.'

Maybe the orbit of the moon losing angular momentum could cause the speed-up of Earth, he added.  

'If that is what happens, the moon gets a lot closer, and the tidal effects become much stronger and more frequent because the periods are driven by the length of the day.' 

{ https://www.dailymail.co.uk/sciencetech/index.html }

12-09-2025 om 21:21 geschreven door peter  

Scientists have issued a breathtaking new update on the mysterious 'interstellar object' racing through the solar system.

This visitor from another solar system, named 3I/ATLAS, is currently rushing towards the sun at 137,000 miles per hour (221,000 km/h).

Now, scientists at the Gemini South Observatory in Chile have captured the clearest images of 3I/ATLAS yet.

And the images reveal one feature which could finally put an end to speculation about whether the object is an alien spacecraft.

The images, taken on August 27 when the object was about 240 million miles (380 million km) from Earth, are some of the first multi-coloured images of 3I/ATLAS.

They reveal a dense icy nucleus surrounded by a broad halo of gas and dust known as a coma.

Most importantly, they also reveal that the object has a long tail stretching behind 3I/ATLAS in the direction opposite to the sun.

This tail measures about one 120th of a degree in the sky, where one degree is about the width of your little finger on an outstretched arm.

Scientists have captured the clearest images yet of the interstellar object 3I/ATLAS as it races through our solar system at 137,000 miles per hour (221,000 km/h)

Scientists from the Gemini South Observatory in Chile captured these images of 3I/ATLAS while it was around 240 million miles (380 million km) from Earth, revealing its clear cometary tail stretching out away from the sun 

Dr Mark Norris, an astronomer from the University of Lancashire who was not involved in the study, told The Daily Mail: 'These new images very clearly demonstrate that 3I/ATLAS is a comet.'

In our own solar system, comets are balls of ice and dust that travel around the sun in very long elliptical orbits, with some only returning every few hundred years.

When comets approach the sun, the heat causes ice made of water or carbon dioxide to sublimate, meaning it turns directly from a solid into a gas.

This cloud of gas and dust that is ejected from the comet's surface collects around the frozen core in the form of a coma and is swept out behind the comet to form a tail.

Since this cloud of particles is highly reflective, comets appear much brighter than rocky asteroids of similar sizes.

The closer the comet gets to the sun, and the more heat it is exposed to, the larger and brighter these features become.

Dr Norris says: 'Early images showed evidence for cometary activity, but the activity was quite weak while it was far from the Sun.

'As 3I/ATLAS approaches the Sun, it is being bathed in more and more sunlight, which increases the amount of material outgassing from the comet, which increases the coma and tail of the comet significantly.'

The new images show that the comet has become significantly more active since previous observations, such as this image taken by the Hubble Space Telescope in July 

These new images show that the tail is now significantly larger than it had been in earlier observations, such as those taken by the James Webb Space Telescope.

Additionally, by taking the images in colour, scientists were able to capture the wavelengths of light that the comet emits, known as its spectrum.

The spectrum tells scientists what kinds of chemicals can be found in the comet and in what proportions - telling us how it formed and how it changes as it passes through the solar system.

Interestingly, this analysis reveals that the ice and dust which make up 3I/ATLAS are broadly similar to those found in comets in our own solar system, with a few important differences.

Dr Matthew Genge, a planetary scientist from Imperial College London who was not involved in the study, told The Daily Mail: '3I/ATLAS has a CO2-rich atmosphere with less water than most home-grown comets.

'This might indicate it formed far from its parent star. Ice forms in early planetary systems by raining out of gas as snow. Water ice forms closer to the star and CO2 ice further away.'

This gives scientists an intriguing insight into the processes of planetary formation taking place around distant stars.

Bryce Bolin, research scientist from Eureka Scientific who was part of the team behind the images, says: 'Every interstellar comet is a messenger from another star system, and by studying their light and colour, we can begin to understand the diversity of worlds beyond our own.'

This is proof that the object is either a comet or a very rare type of icy asteroid, clearly demonstrating that it is a natural object and not some form of alien craft 

There is only a short window in which 3I/ATLAS will be observable, so scientists are trying to gather as much data as they can to learn about these distant worlds.

Importantly, these observations also conclusively dismiss the theories that 3I/ATLAS is some sort of alien craft.

Previously, researchers such as Harvard physicist Professor Avi Loeb had suggested that 3I/ATLAS might be an artificial spacecraft of some kind.

Professor Loeb has publicly discussed the possibility that 3I/ATLAS could be a giant, nuclear-powered vessel.

This claim was largely based on the fact that 3I/ATLAS was supposedly too large and too bright to be produced by natural forces.

However, the evidence of a bright coma and a tail is a clear natural explanation for the object's unexpected brightness and seemingly impossible size.

Dr Genge says that the Gemini South images clearly indicate that 3I/ATLAS is a natural object.

'Little green men certainly aren't responsible!' he added.

{ https://www.dailymail.co.uk/sciencetech/index.html }

11-09-2025 om 16:16 geschreven door peter  

NASA has announced the discovery of what it believes to be ancient microbial life on Mars. 

The new administrator for the space agency, Sean Duffy, said a sample collected by the Perseverance rover has been declared the 'clearest sign of life' ever found on the Red Planet.

In a Wednesday news conference, NASA's Associate Administrator Nicky Fox said: 'This is the kind of signature that we would see that was made by something biological.'

Specifically, researchers have been looking at unusual spots and seed-like shapes in ancient Martian rocks that might point to the existence of tiny life forms in the distant past.

These features, nicknamed 'poppy seeds' and 'leopard spots,' were spotted in mud-like rocks in Neretva Vallis, part of the Jezero crater, where a river existed billions of years ago.

Scientist Joel Hurowitz revealed how these tiny signatures found in the crater pointed to the existence of life on Mars long before most organisms emerged on Earth.

Although the findings have been discussed for months, Hurowitz noted that scientists needed to gather more data from Neretva Vallis and confirm the results with other researchers before releasing the conclusion that this could be Martian life.

'We are here to say this is exciting, and we want to share that news. This could be very real,' Duffy continued. 

In 2024, Perseverance spotted a vein-filled arrowhead-shaped rock that featured chemical signatures and structures likely formed by microbial life billions of years ago

NASA Administrator Sean Duffy (center) revealed that a sample collected by Perseverance is the 'clearest sign of life' on Mars ever found in 30 years

The rover's tools detected chemicals like iron and phosphorus in these spots, which can form when tiny microbes break down organic material, a sign of life here on Earth. 

The NASA robot has been beaming back images to Earth since 2021, revealing crystalline solids left over from water flowing on the surface of Mars, and a reddish area that contained organic compounds and an energy source for what could have been microbial life.

Perseverance collected the new life-proving rocks on July 21, 2024, while exploring the northern edge of Neretva Vallis, the ancient river valley formed roughly 3.7billion years ago.

Scientists noticed the vein-like structures throughout, finding they were white calcium sulfate.

The crystalline solids on the Martian surface are hard-water deposits left behind by ancient groundwater flowing through the now-dusty landscape.

Between those veins were bands of material with a reddish color suggesting the presence of hematite, one of the minerals that gives Mars its distinctive rusty hue.

Duffy noted that the announcement on Wednesday was the culmination of 30 years of research on the Red Planet.

He added that the latest findings went through a peer-review process, just like scientific studies in all fields, which proved the samples likely had a biological origin.

NASA officials revealed new findings by the Perseverance rover, which has been exploring Mars (pictured) since 2021

Perseverance took a selfie in the Jezero crater on Mars when it found the biological samples

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When asked if NASA plans to retrieve the potential organic samples from Mars, Duffy said the space agency was still looking at how and when they could get the rocks back to Earth, adding that 'we're going to look at our budgets'.

The new administrator appointed by President Trump noted that 'the president loves space' and believed NASA has the money to complete its work, which is now focused on manned space missions.

Duffy noted the space agency's mission was going to be 'a little more focused' but felt comfortable asking the White House for more funding if it was needed to confirm the findings on Mars.

'At no point has this administration said "we don't care about samples,"' Fox added while addressing questions about NASA's changing priorities regarding Mars exploration.

Previously, the Trump administration had cut the Mars sample retrieval mission from its budget proposal for NASA.

It was part of $6billion slashed from NASA's future budget in the May proposal to Congress, even though the ongoing sample study had already cost billions.

Duffy said NASA was now looking at a faster and more cost-effective way of getting Perseverance's samples back for examination.

As for NASA's upcoming space missions, Duffy revealed that four astronauts will circle the moon 'early next year' as part of the Artemis II lunar mission.

'We're going back to the moon,' the administrator declared.

Duffy added that 'about a year and a half' after the Artemis II mission, the Artemis III astronaut mission will 'land and establish a long-term presence of life on the moon led by America'.

NASA's new leader continued by saying that what astronauts learn from the renewed missions to the moon will help in future efforts to 'put American boots on Mars'.

Marked by seven benchmarks, the Confidence of Life Detection, or CoLD, scale outlines a progression in confidence that a set of observations stands as evidence of life. 

Credit: NASA

This animation depicts water disappearing over time in the Martian river valley Neretva Vallis, where NASA’s Perseverance Mars takes the rock sample named “Sapphire Canyon” from a rock called “Cheyava Falls,” which was found in the “Bright Angel” formation.

Credit: NASA

{ https://www.dailymail.co.uk/sciencetech/index.html }

11-09-2025 om 15:16 geschreven door peter  

Scientists reveal what ancient Martians might have looked like - as NASA announces strongest evidence yet for life on the Red Planet

• READ MORE: NASA finds clearest sign of life on Mars

By WILIAM HUNTER, SCIENCE & TECHNOLOGY REPORTER

Yesterday, NASA made the startling announcement that its scientists have uncovered the 'clearest evidence' yet for the existence of life on Mars.

Last year, NASA's Perseverance rover discovered that a dry riverbed just north of the Martian equator is dotted with rusty circular markings known as 'leopard spots'.

According to NASA administrator Sean Duffy, the space agency now believes these marks could have been left by ancient lifeforms which lived billions of years ago.

Now, scientists have revealed what these alien organisms might have looked like. 

Any life that evolved on Mars would have had to contend with harsh radiation, weak gravity, and temperatures that can swing between 20°C (70°F) in the day and -153°C (-225°F) at night. 

However, the scientists behind this groundbreaking research say that it is still possible for some forms of life to evolve. 

If there were life on Mars, it would almost certainly consist of very simple microbial organisms like bacteria.

In the unlikely case that more complex life did evolve somewhere on the Red Planet, it would need to develop special adaptations to survive this impossibly harsh climate.

NASA has revealed the 'clearest evidence' yet for the existence of life on Mars, as it claims that 'leopard spots' on Martian rocks could have been created by ancient microbes

Scientists say that Mars' Jezero Crater was once filled with water that would have been 'clement' for microbial life to develop. Pictured: AI-generated impression 

What did NASA find on Mars?

While investigating a region known as the 'Bright Angel', NASA's Perseverance rover spotted a group of unusual markings that resemble leopard spots.

Scientists call these spots 'reaction fronts', and they are points of contact where chemical and physical reactions have occurred in the past. 

Critically, Perseverance's on-board lab found that these spots contained two iron-rich minerals: Vivianite, which is found in decaying organic matter, and greigite, which is produced by microbes on Earth.

Dr Keyron Hickman-Lewis, an Earth scientist from Birkbeck, University of London and co-author of the NASA report, told Daily Mail: 'The kinds of organic–mineral associations observed at Bright Angel that are reported in this paper are known to be generated by microbial life on Earth, and so it is a very promising observation to see something so similar on Mars.

'Certainly, I think that this is the most compelling potential evidence of life on Mars found to date.'

The scientists can't yet rule out that these spots could be caused by non-biological processes, and Dr Hickman-Lewis says that this is not a 'smoking gun'.

However, after spending a year reviewing the evidence and looking for alternative explanations, the researchers are now confident enough to say that this could be a 'biosignature', an elusive sign which proves the existence of life.

These signs of life were found by the Perseverance rover in a region called 'Bright Angel'. Researchers say that chemicals found in the leopard spots are produced by biological processes on Earth 

Although Mars is now a barren desert, billions of years ago, it would have been covered with rivers and lakes that could have supported life 

Dr Hickman-Lewis adds: 'The Mars 2020 team does not use the term "potential biosignature" lightly.'

What would this life look like?

The potential signs of life were found in a region called Jezero Crater, an impact basin just north of the equator.

Although it is now a barren wasteland, billions of years ago, the Jezero Crater was filled with water that could have been home to life.

If life did exist in these waters, the most plausible explanation is that it was some sort of simple microorganism.

Dr Hickman-Lewis says: 'The environment in which these potential biosignatures were found seems to be a low-temperature water-rich setting and therefore very clement for microbial life.'

In their paper, published in Nature, the researchers suggest that microbes could have fed on the naturally occurring carbon, sulphur, and phosphorus in the rocks.

These microbes would have then 'excreted' the minerals which we now see as leopard spots.

NASA Administrator Sean Duffy (center) revealed that a sample collected by Perseverance is the 'clearest sign of life' on Mars ever found in 30 years

The Jezero Crater, where the potential signs of life were found, was once a river delta. Observations from orbiting spacecraft show patterns of sediment that are similar to those made by rivers on Earth. Pictured: AI-generated impression 

As microbes fed on the carbon, sulphur, and phosphorus in the rocks, they might have released iron-rich chemicals which permanently stained the rocks to leave 'leopard spots'. Pictured: AI-generated impression 

The conditions on the surface would have been incredibly harsh, but the researchers say that life still could have eked out a simple existence.

Dr Sanjeev Gupta, an Earth scientist from Imperial College London and member of the research team, told Daily Mail: 'There was liquid water present at the surface at the time billions of years ago, so it was a habitable environment. 

'This would have been simple microbial life. We can say much more than that.'

Since we can only see the possible traces left behind by these microorganisms, it's difficult to know what they might have looked like or how they behaved.

However, it is possible to make some very general predictions based on parallels from Earth.

Professor Michael Garrett, an astronomer from the University of Manchester and Director of Jodrell Bank Centre for Astrophysics who was not involved in the study, told Daily Mail: 'Think of hardy bacteria, similar to terrestrial extremophiles that thrive in very salty, cold, or low-oxygen conditions here on Earth.

'Good analogues are the microbial mats in very salty lakes or microbes that live kilometres underground in Earth’s crust or in the high desert in Chile.

'These examples show us that life can be tough, minimalistic, and persistent even in places where surface conditions are brutal.'

Scientists say that the best parallels for what life might have looked like are the microbial mats that form in extremely salty lakes on Earth. Pictured: AI-generated impression 

It is unlikely that more complex life could have evolved since Mars' climate changed rapidly about a billion years after the first microbes could have appeared. This means complex organisms like animals probably didn't have time to develop. Pictured: AI-generated impression 

Could more complex life have evolved? 

If these leopard spots really are biosignatures, then the researchers say it's unlikely that they only existed in one place.

Perseverance is currently studying very ancient rocks outside of the Jezero Crater to look for signs of more widespread life.

However, it is extremely unlikely that more complex life evolved anywhere on the Red Planet.

The researchers think that microbes emerged on Mars around the same time that life was getting started on Earth.

However, after about one billion years, Mars' climate began to change rapidly as solar winds stripped away its atmosphere - leaving the planet very cold and dry.

Professor Garrett says: 'Those harsh conditions on Mars after 1 billion years would put strong limits on body size and complexity of any lifeform.

'It took really complex life, like animals, another 3 billion years before they appeared on the Earth, where the conditions were much better to support energy-hungry complex life forms.'

If complex life had emerged, it would have needed to develop adaptations like thick skin or live underground to avoid the intense radiation of the Martian surface. Pictured: AI-generated impression 

On Earth, some of the first animals to evolve were simple filter feeders. Filter feeders also survive in extreme environments such as hydrothermal vents, so complex Martian life might have followed a similar evolutionary trajectory. Pictured: AI-generated impression 

In the unlikely case that more complex life did evolve, Mars' harsh conditions would also put strong constraints on what it might look like.

'It would need to be adapted to survive the intense UV radiation from the Sun, extreme cold, and limited liquid water - we don’t really see complicated animal life in such environments,' says Professor Garret.

He adds: 'If they were present, they would need protection from the UV radiation from the sun – maybe a thick skin, for example, or perhaps mostly living under the Martian soil.'

That means complex life might resemble creatures on Earth that live in exceptionally harsh environments, such as desert-dwelling lizards or the simple filter-feeders that survive near hydrothermal vents.  

{ https://www.dailymail.co.uk/sciencetech/index.html }

11-09-2025 om 14:40 geschreven door peter  

Scientists are finally learning what's inside mysterious 'halo' barrels submerged off Los Angeles

By Chris Simms

At first thought to hold the pesticide DDT, some mysterious barrels dumped in the deep sea near Los Angeles actually contain caustic alkaline waste that stops most life from living nearby.

The toxic barrels, which came to public attention in 2020, appear to have "halos" around them — and researchers have finally figured out why. 

(Image credit: Schmidt Ocean Institute.)

Thousands of barrels of industrial waste litter the ocean floor off Los Angeles and have been there for decades — but scientists still don't fully understand what chemicals this junkyard is leaking into the environment.

Now, research has revealed that some of the chemicals leaking from the barrel graveyard have been identified as strongly alkaline, the chemical opposite of acidic — and they are still concentrated enough to stop most life living nearby.

Between the 1930s and early 1970s, radioactive waste, refinery waste, chemical waste, oil-drilling waste and military explosives were dropped into 14 dump sites in deep water off the coast of Southern California, according to the U.S. Environmental Protection Agency.

This huge underground junkyard came into the public consciousness in 2020, when an LA Times article revealed that deep-sea robot surveys had discovered dozens of barrels littered over the sea floor. Then, in 2021 and 2023, follow-up surveys by the Scripps Institution of Oceanography in California identified some 27,000 shapes that seemed to be barrels and more than 100,000 total debris objects on the seafloor. Some suspected that the barrels, many of which were encircled by whitish haloes in the sediment, contained the now-banned pesticide DDT, because the area is heavily contaminated with it.

But to this day, the total number of barrels on the seafloor — and what most of them contain — remains unknown.

Now, Johanna Gutleben, a microbiologist at the Scripps Institution, and her colleagues have revealed the results of sediment samples taken near five barrels using a remotely operated vehicle in 2021. They found that levels of DDT contamination didn't increase closer to the barrels, so they say the drums didn't contain that chemical.

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Three of the barrels they checked had white halos around them and all the samples from near these barrels had an extremely high pH (around 12) and very few microbes living there, so the team say the barrels contained caustic alkaline waste, which can damage organic matter and leach out high concentrations of potentially toxic metals.

The team's study was published Tuesday (Sept. 9) in the journal PNAS Nexus.

"Up to this point we have mostly been looking for DDT. Nobody was thinking about alkaline waste before this and we may have to start looking for other things as well," Gutleben said in a statement.

The sampling didn't identify which specific chemicals were in the barrels, but notably, DDT manufacturing produces alkaline waste, as does oil refining.

"One of the main waste streams from DDT production was acid and they didn't put that into barrels," said Gutleben. "It makes you wonder: What was worse than DDT acid waste to deserve being put into barrels?"

As the researchers found very limited levels of microbial DNA near the barrels, they say the alkali waste likely transformed parts of the seafloor into extreme environments where most life can't survive. They did find traces of some specialized bacteria, though — species from families adapted to alkaline environments, like deep-sea hydrothermal vents and alkaline hot springs.

The team also discovered how the weird haloes form. When the alkaline waste leaks from the barrels, it reacts with magnesium in the water and creates a mineral form of magnesium hydroxide, called brucite, forming a concrete-like crust. The brucite then slowly dissolves, keeping the pH in the sediments high while leading to reactions in surrounding seawater. This results in the formation of calcium carbonate, which settles as white dust around the barrels.

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Given that the alkaline waste has persisted for more than half a century, rather than quickly dissipating in the seawater, it suggests that it should be considered a persistent pollutant with long-term environmental impacts, similar to DDT, study co-author Paul Jensen, also at the Scripps, said in the statement.

"It's shocking that 50-plus years later you're still seeing these effects," he said.

The researchers suggest using the white halos to identify which barrels contain alkaline waste so the overall extent of contamination can be assessed. Jensen said roughly one-third of the barrels that have been seen so far have halos, but it's unclear if this ratio will hold as more barrels are uncovered.

{ https://www.livescience.com/space }

10-09-2025 om 22:17 geschreven door peter  

NASA spots bizarre 'turtle' on Mars

The featured rock has garnered comparisons to a turtle, thanks to a head with two eyes that look as if it has protruded from a protective "shell" with a pair of "front legs" on either side (see image below).

It is currently unclear which geological processes have shaped the rock into this unusual shape.

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The Mars rovers have collectively captured tens of thousands of photos of Mars' surface, most of which feature multiple different rocks or other geological features that have been sculpted into unique shapes by ancient water sources or millenia of strong winds. Every once in a while, one of these rocks bears a resemblance to something we can see on Earth, such as blueberries, human-like fingerprints, a mysterious doorway and even a "Star Trek" symbol, to name a few.

These associations are often made due to pareidolia — a psychological phenomenon where the human mind perceives a familiar pattern, such as a face or image, in random objects or structures, such as clouds.

Perseverance has been particularly good at spotting these weird rocks during its five-year mission. Its other recent finds include a bizarre medieval "helmet" that it wheeled past in August and an out-of-place "skull" that is snapped in April.

The Martian turtle is not the only "animal" to be spotted on the Red Planet. In recent years, Mars-orbiting spacecraft have also spotted larger geological features with a zoological appearance, including a Dog-shaped blob beneath the planet's North Pole, a grinning cartoon-like teddy bear and seasonal swarms of "spiders" crawling across the Martian surface.

{ https://www.livescience.com/space }

10-09-2025 om 22:06 geschreven door peter  

'Incredibly exciting': NASA claims it's found the 'clearest sign' yet of past life on Mars

By Ben Turner  

NASA scientists have found more intriguing details on speckled Martian rocks spotted by the Perseverance rover. But bringing samples back to Earth will be key.

A selfie taken by NASA's Perseverance Rover while on Mars. 

(Image credit: NASA)

Strange nodules of unusual minerals found on speckled rocks on Mars have offered more tantalizing clues that ancient life may have once thrived on the now-dead planet, NASA says.

NASA's Perseverance rover found one such arrow-shaped rock, nicknamed Cheyava Falls, in 2024 along the northern bank of Neretva Vallis, the dried-up remnants of an ancient river that once rushed into Mars' Jezero crater.

An initial analysis of the rock, which appeared in a lake bed formation known as Bright Angel, revealed it was crammed with organic compounds, had evidence that water once flowed through it, and contained flecks of leopard-like spots from chemical reactions that ancient microbes could have used for energy.

These features may result from non-biological processes occurring over millions of years. But now, in a new study published Sept. 10 in the journal Nature, NASA scientists have announced intriguing details about additional rock samples found at two nearby sites — and they say these clues bolster the case for past life on Mars.

"After a year of review, they have come back and they said, listen, we can't find another explanation," Acting NASA Administrator Sean Duffy, said during a news briefing following the announcement. "So this very well could be the clearest sign of life that we've ever found on Mars, which is incredibly exciting."

Since arriving on Mars in 2021, Perseverance has been trundling across the 30-mile-wide (50 kilometers) Jezero crater, collecting dozens of rock samples for eventual return to Earth. Upon finding the leopard-spotted rock, scans by the rover's Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) instrument showed that the specimen contained carbon-based molecules, alongside bands of reddish hematite that featured spots of iron and phosphate.

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"When the rover entered Bright Angel and started measuring the compositions of the local rocks, the team was immediately struck by how different they were from what we had seen before," study co-author Michael Tice, a geobiologist and astrobiologist at Texas A&M University, said in a statement. "They showed evidence of chemical cycling that organisms on Earth can take advantage of to produce energy. And when we looked even closer, we saw things that are easy to explain with early Martian life but very difficult to explain with only geological processes."

The additional discoveries announced by NASA today relate to clay-rich rock samples found at two sites, named Sapphire Canyon and Masonic Temple, containing vivianite, an iron-phosphate mineral, and greigite, a mineral containing iron sulfide.

These minerals may have formed from reactions between the mud and organic matter, according to the scientists. The minerals' distribution across the rocks appears to support this hypothesis.

"It's not just the minerals, it's how they are arranged in these structures that suggests that they formed through the redox cycling [in which bacteria are key players on Earth] of iron and sulfur," Tice said. "On Earth, things like these sometimes form in sediments where microbes are eating organic matter and 'breathing' rust and sulfate. Their presence on Mars raises the question: could similar processes have occurred there?"

Nonetheless, a definitive ruling over the biological or non-biological processes that created the patterns can only be made in labs on Earth, and whether Perseverence's precious cargo will be fetched for that analysis remains a contentious political question.

The European Space Agency (ESA) and NASA originally proposed the use of NASA’s Sample Retrieval Lander — a spacecraft carrying a small rocket — to collect the rover's samples by 2033 as a part of their Mars Sample Return mission. The rocket would then launch back into orbit with the samples.

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But the mission, now significantly over budget and delayed, is facing cancellation from the Trump administration's planned budget cuts to NASA. Meanwhile, China has revealed its own plans for a Mars sample-return mission that could launch by 2028.

When pressed by reporters during a Q&A session following the announcement, Duffy was unable to confirm if or when the sample-return mission would happen, but he remained optimistic.

"The president loves space — he asked me about it," Duffy said. "I give him updates, how it's going, what we're doing, and he doesn't brush me off."

"If there was an issue with resources, I would go to him and I'm sure he would support us," he added.

{ https://www.livescience.com/space }

10-09-2025 om 21:54 geschreven door peter  

NASA vindt aanwijzingen dat er vroeger misschien leven was op Mars

In een rots op Mars zijn aanwijzingen gevonden dat er vroeger misschien leven op de planeet mogelijk was. De steen heeft "potentiële tekenen voor oud leven van microbes". De Amerikaanse ruimtevaartorganisatie NASA zegt "niet eerder zo dicht bij het ontdekken van leven op Mars te zijn geweest". De organisatie houdt nog wel een slag om de arm en zegt dat er ook andere verklaringen mogelijk zijn.

De onbemande robotjeep Perseverance ontdekte in juli vorig jaar een rots met luipaardvlekken. Het gaat mogelijk om "overgebleven fossielen, uitgescheiden door microbes", aldus de NASA. De ruimtevaartorganisatie zegt de vondst te hebben voorgelegd aan wetenschappers. Zij zouden hebben geconcludeerd dat oud leven de meest logische verklaring is, blijkt uit een artikel in het wetenschappelijk tijdschrift Nature.

Al kunnen de onderzoekers ook andere verklaringen, waarbij geen biologisch leven betrokken is, niet uitsluiten. Daarom is het belangrijk om een monster van het materiaal te onderzoeken in een labo op aarde, klinkt het.

De Perseverance landde in 2021 op Mars. De verkenner met zes wielen heeft twintig camera's en een boor aan boord om de planeet te onderzoeken. Het werkgebied van de rover is de krater Jezero. Miljarden jaren geleden, toen op Mars mogelijk water stroomde, mondde daar mogelijk een rivier uit in een meer.

De robotjeep onderzoekt stalen, maar transporteert die niet. Daarvoor zijn andere robotten nodig. Vraag is wel of de NASA daar nog geld voor zal vinden, nadat de Amerikaanse president Donald Trump vraagtekens plaatste bij de plannen om materiaal vanop Mars naar de aarde te brengen.

{ Belga.press }

10-09-2025 om 20:35 geschreven door peter  

The Gemini South Telescope Takes A Turn Imaging The Interstellar Comet 3I/ATLAS

By Evan Gough 

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{ https://www.universetoday.com/ }

10-09-2025 om 18:43 geschreven door peter  

Deep exposures on 7 September 2025 show 3I/ATLAS wrapped in a green coma.

(Credit: M. Jäger and Gerald Rhemann)

I have been staring at 3I/ATLAS for weeks, not through an eyepiece, but through the stack of reports and images that keep arriving. At first the object looked reddish. Now its glow reads as green. The gas around it is heavy on carbon dioxide and thin on water, which is not how a regular comet behaves near the Sun. In some images the light seems to extend toward the Sun rather than away from it. That is the kind of detail that makes you sit up, because it refuses to fit neatly into the usual picture.

One anomaly can be a measurement quirk. A handful of them begins to sound like a pattern. With 3I/ATLAS we have color change, unusual chemistry, odd scattering of light, and a path that hugs the plane of the planets more closely than chance would suggest. When you place those facts side by side, you get a portrait that does not match the familiar family of icy bodies in the solar system where we are from.

This is where the culture of science matters. Many researchers are careful, honest, and conservative in how they talk about data. That caution serves the field well. It also means that oddities sometimes get smoothed out by language before they are faced head on. PRofessor Avi Loeb takes a different tack. He keeps pointing at the data and asking simple questions in public. He does not chase applause and he does not hide behind comfortable phrasing. I respect that. Science is not a popularity contest. It is a process for finding out what is true in the world, and that process only works if people are willing to ask the questions that feel awkward.

Let me be direct about one thing. I do not think 3I/ATLAS is an alien spacecraft. I would love it to be, sure. Natural explanations should be worked through first, with patience and rigor. The chemistry could reflect a crust rich in carbon dioxide ice. The color shift could track changes in sunlight and temperature that wake up different molecules at different distances. The odd light pattern could be geometry and timing. I mean, remember the face on Mars? There is work to do before anyone should claim anything extraordinary.

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Still, I will take the other path because it is worth thinking clearly about it. If 3I/ATLAS were artificial, it would almost certainly not carry living organisms. Biology does not like deep space. It breaks down under radiation and time. A machine can wait and repair itself. An autonomous probe guided by artificial intelligence makes more engineering sense for an interstellar mission than a cabin full of breath and bone. That is not a romantic picture, but it is a practical one.

I keep returning to ʻOumuamua. (I also loved Loeb’s book on ʻOumuamua) It was small, fast, and behaviorally odd. It showed no clear signs of venting, yet its motion suggested a small push that gravity alone did not account for. It looked nothing like the textbook comets we teach. It passed. Many argued. It kept its secrets. If you allow a speculative frame for one paragraph, you can imagine ʻOumuamua as a scout, a light vehicle meant to sense, sample, and move on. You can then imagine 3I/ATLAS as a larger platform with a different set of capabilities. If that picture were true, it would point to a civilization far beyond us in age and capacity, one that builds in classes of craft and sends them across star systems as calmly as we send weather satellites across the Atlantic.

I am not claiming that is the case. I am laying out a clean line of reasoning so that readers understand what is at stake when we talk about anomalies. The right response is not to fall in love with the extraordinary answer. The right response is to gather the kind of data that lets the ordinary answer win on evidence, not on habit.

Here is what the data say in plain terms. When 3I/ATLAS was far from the Sun, the light it threw around itself increased very quickly as it moved inward. Once it crossed a certain distance, that increase slowed. That pattern suggests that the material around it changed character. At first the light likely bounced off dust lifted from a dark surface layer. Closer in, fresh, small ice grains likely took over and brightened the glow in a different way. Independent observations show a gas plume dominated by carbon dioxide, with smaller amounts of carbon monoxide and only traces of water. That is unusual when set next to the comets that spend their lives in our system. But thenagain, space is weird, and the universe has so many secrets we are just starting to explore.

You do not need to be a specialist to grasp the next step. If an object from another star looks different from most of our comets, we should not force it into the old mold. We should describe it as it is and ask what that tells us about where it came from, how it formed, and how it is changing now. That is the heart of science. Describe the thing. Test the description. Change your mind when the facts warrant it.

This is also where public conversation can go wrong. People hear “anomaly” and think “mystery solved by a wild claim.” That habit hurts everyone. The better habit is calm curiosity. Loeb often argues for that posture, even when it upsets colleagues. He asks for open data, independent measurements, and patient analysis. He reminds us that history is full of mistakes that felt safe at the time. The Sun did not circle Earth. Diseases did not spring from bad air. Continents did not stand still. Our job is not to protect an old story. Our job is to find the right one.

So what should we do with 3I/ATLAS right now? Keep observing. Compare instruments. Cross-check photometry and spectra. Model the light scattering with more than one set of assumptions. Publish the methods in detail. Invite rival teams to replicate the results. Treat the object as a laboratory for learning about interstellar debris, not as a prop in a culture war between skeptics and believers. If the mundane explanation is correct, it will earn its place by explaining the color, the chemistry, and the geometry without hand-waving. If it fails, we will know exactly where it fails, and that will be valuable.

I will close where I began. The sky is not tidy. It is real and indifferent. It holds dust that glows green and rocks that tumble and gas that tricks the eye. We do not honor it by draping it in stories that flatter us. We honor it by looking closely, asking better questions, and letting evidence lead, even when it drags us somewhere we did not plan to go. If 3I/ATLAS turns out to be a strange but natural traveler, that will be worth knowing. If it is something else, we will need the same tools and the same temperament to face that result. Either way, curiosity and discipline carry us forward.

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{ https://curiosmos.com/category/alien-theories/ }

09-09-2025 om 21:25 geschreven door peter