Een nepafbeelding herkennen is eenvoudig, als je weet hoe: hier lees je waar je op moet letten

Door Janine

Valse afbeeldingen en desinformatie op internet

Unsplash

Het is inmiddels voor iedereen duidelijk dat het internet niet meer de vrije en verantwoordelijke plek is die het aan het begin van zijn geschiedenis leek te zijn. Vandaag de dag zijn sociale media zowel een informatiemiddel geworden als kanalen waar desinformatie zich snel verspreidt. Een groot deel van het nepnieuws wordt publieke kennis, mede dankzij valse of gemanipuleerde beelden die onware verhalen ondersteunen. Het probleem is dat deze beelden vaak niet van echt te onderscheiden zijn: in combinatie met de onmiddellijke verspreiding van een inhoud op sociale media, wordt het onmogelijk om nepnieuws van echt nieuws te onderscheiden.

Zoals we in de inleiding al zeiden, heeft Google een aantal gratis tools beschikbaar gesteld waarmee het mogelijk is om een nepafbeelding te herkennen. Natuurlijk is het niet zo direct als doemscrollen op een social, maar het is wel een mogelijkheid om te voorkomen dat je nepnieuws gelooft. Misschien is een afbeelding bewerkt, misschien is deze helemaal gecreëerd: is het, met de mogelijkheid het nooit te weten, dan niet beter om te begrijpen hoe je het kunt herkennen?

Google en factchecking van nepnieuws, ook voor afbeeldingen

Unsplash

Het eerste hulpmiddel dat Google ter beschikking stelt, is de Fact Check Explorer, essentieel voor het verifiëren van valse beweringen over foto's en video's die op internet circuleren. Dit is een bijzonder nuttig hulpmiddel voor journalisten en nieuwsmedia, maar de toegang hiertoe is gratis. Al vanaf de startpagina is het mogelijk om te zien welke foto's en video's onlangs door de tool zijn geverifieerd, maar dat is nog niet alles.

Door een eenvoudige zoekopdracht op een trefwoord uit te voeren, geeft de Fact Checker een lijst met foto's die geverifieerd moeten worden. Sommige zullen waar zijn, sommige zullen zonder context zijn, sommige zullen gemarkeerd zijn als nep, enzovoort. Daarnaast is het ook mogelijk om op afbeeldingen te zoeken: deze mogelijkheid is al aanwezig in de klassieke Google zoekmachine, maar is vooral handig in de Fact Check Explorer. Door een afbeelding te uploaden, kan de tool deze vergelijken met bronnen op het web en begrijpen of het een echte of nepafbeelding is.

Soms hoef je alleen maar de informatie bij de afbeelding te lezen

Pexels

Google's Fact Checker Explorer is een krachtig en eenvoudig te gebruiken hulpmiddel, maar er is een nog eenvoudigere functie die ons op zichzelf in staat zou kunnen stellen om een nepafbeelding te herkennen. Om het te gebruiken en het potentieel ervan te realiseren, hoef je alleen maar:

• te zoeken naar een trefwoord op Google;
• “afbeeldingen” te selecteren en vervolgens de afbeelding die we willen controleren;
• op de drie puntjes naast het resultaat klikken;
• “over deze afbeelding” selecteren.

De zoekmachine opent dan een tabblad met de belangrijkste exemplaren van die afbeelding op internet en de eerste datum van online publicatie. Misschien is dat beeld bij een recente gebeurtenis onlangs verschenen en kan het daarom ook waarheidsgetrouw blijken te zijn. Misschien is het een afbeelding dat al enkele jaren oud is, maar gebruikt werd om verontwaardiging op te wekken over een recente gebeurtenis: ook in dit geval is het beter om het te weten, toch?

Zoals we kunnen zien, is de verspreiding van valse afbeeldingen een steeds ernstiger probleem. Tegelijkertijd zijn er hulpmiddelen om te begrijpen of we met een valse afbeelding worden geconfronteerd. Het is gemakkelijk om niet in nepnieuws te trappen: je hoeft alleen maar te weten hoe je deze tools moet gebruiken, of de tijd vinden om dit te doen tussen het ene sociale netwerk en het andere.

{ https://www.curioctopus.nl/ }

01-06-2024 om 15:30 geschreven door peter  

The notion that giants once roamed the earth has been widely discussed and supported by photographs of their skulls and skeletons found worldwide. 

Ancient megalithic structures, enormous and enigmatic, prompt us to question their builders. It seems impossible that human beings could have constructed such structures. 

Take, for instance, the colossal stones of Sacsayhuamán in Peru. When The conquistadors asked theInca about the walls at Sacsayjuaman, the Inca told them the Giants had built it. 

Similarly, Malta, an island steeped in history and legend, houses mysterious megalithic structures that have baffled archaeologists for centuries. These massive stone temples, among the oldest globally, appear beyond the capabilities of prehistoric farmers. 

However, the intrigue doesn't stop there.

Legends speak of the Nephilim, giant beings believed to have built these monumental structures. Some theories even suggest their descendants might still reside underground today. 

We investigate the possibility of these giants, examining bones, elongated skulls, and mysterious hidden subterranean chambers called The Hypogeum.

  

{ https://ufosightingshotspot.blogspot.com/ }

01-06-2024 om 15:12 geschreven door peter  

The team’s discovery seems to be linked to the concept of disappearing stars. Over the last few years, it has become evident that some stars seem to just vanish from view, neither passing through the planetary nebula phase nor going supernova. The discovery of supermassive stars undergoing complete collapse without supernova now provides a good explanation for the phenomenon. 

The team reached their conclusion when they explored an object known as VFTS 243; a binary system which includes a star thought to be 25 times more massive than the Sun and a blackhole 10 times more massive than the Sun. Both objects orbit a common centre of gravity over a period of 10.4 days and lie in the Tarantula Nebula in the Large Magellanic Cloud – 160,000 light years away. The binary system is not the first of its kind to be discovered, such systems have been known about for decades. 

Studying the system revealed the orbit was almost circular. Given that one of the stars had collapsed into a black hole, the nearly circular orbit and the lack of any evidence of an explosion all point to a star that collapsed completely. The complete collapse meant that all matter from the star collapsed into the blackhole and no material escaped out as a supernova. Could it be then that the team have finally revealed the mechanism by which massive stars have been vanishing? It certainly looks like it but further observations of binary systems with stars and black holes is required to confirm. 

Source : 

• Constraints on Neutrino Natal Kicks from Black-Hole Binary VFTS 243

{ https://www.universetoday.com/ }

01-06-2024 om 15:02 geschreven door peter  

Dr. Swindle follows this with, “There are two basic types of motivation. One is that we’re planning on bringing all these rock samples, and we’re going to be interested in knowing how they’ve interacted with the atmosphere, but we can’t figure that out without knowing the composition of the atmosphere in detail. So, we need an atmospheric sample to know what the rocks might have been exchanging elements and isotopes with. But we’d also like to have a sample of the Martian atmosphere to answer some basic questions about processes that have occurred, or are occurring, on Mars. For example, Martian meteorites contain trapped atmospheric noble gases, like krypton and xenon. But it appears that there are at least two different “atmospheric” components in those meteorites.”

For the study, the researchers proposed several benefits of returning a Mars atmospheric sample to Earth, including atmospheric samples being among the NASA Perseverance (Percy) rover sample tubes, gaining insight into potential solar gar within the Martian interior, evolutionary trends in atmospheric compositions, nitrogen cycling, and sources of methane on Mars. For the Percy atmospheric sample, also known as Sample No.1 “Roubion”, the study notes how this sample was obtained after Percy tried to collect a rock core sample but ended up collecting atmospheric gases instead. Additionally, the study proposes the lack of leakage the sample tube will experience while awaiting its return to Earth and the gases present within the sample are ideal for analysis once returned to Earth, as well. But aside from the Percy rover sample, how else could a Martian atmosphere sample be obtained?

“At least two other ideas for collecting a sample of Martian atmosphere have been suggested,” Dr. Swindle tells Universe Today. “One is to fly a spacecraft through the Martian atmosphere, collect a sample as it goes through, then return it to Earth. The other is to have a sample return “cannister” (it doesn’t have to be any bigger than a Perseverance tube) that has valves and a (Martian) air compressor. You could land it on the surface of Mars, open the valve to the atmosphere, turn on the compressor, and get a sample that has hundreds or thousands of times as much Martian atmosphere as a volume that is just sealed without compression, as Perseverance has done, and hopefully will do again.”

Dr. Swindle and Dr. Young both mention the Sample Collection for Investigation of Mars (SCIM) mission, which was proposed in 2002 by a team of NASA and academic researchers with the goal of collecting atmospheric samples at an altitude of 40 kilometers (25 miles) above the Martian surface and return them to Earth for further analysis. While SCIM was selected as a semi-finalist for the 2007 Mars Scout Program, it was unfortunately not selected for further development, and both Dr. Young and Dr. Swindle tell Universe Today there are currently no atmospheric sample missions being planned aside from the Percy rover sample. Therefore, what follow-up studies from this research are currently underway or being planned?

Dr. Swindle and Dr. Young both mention how efforts are being made to collect small quantities of atmospheric gas due to the small size of the sample tubes, with Dr. Swindle telling Universe Today, “A big set of questions right now is how good a sealed Perseverance tube would be at containing an atmospheric sample. How good is the seal? Might the tube spring a leak on a hard landing? Would some molecules in the Martian atmosphere stick to the coatings of the tubes? There’s been some activity on all of these questions, and so far, the answers have all been good – it looks like those Perseverance tubes may do well, even though they weren’t really designed with atmospheric sampling in mind.”

As noted, the purpose of obtaining and returning an atmospheric sample from Mars could help scientists better understand the formation and evolution of the Red Planet. While present-day Mars is a very cold and dry world with an atmosphere that is a fraction of the Earth’s atmosphere, with liquid water being unable to exist on the surface, along with no active volcanism, as well. However, significant evidence obtained from landers, rovers, and orbiters over the last several decades point to a much different Mars billions of years ago after it first formed. This included an active interior that produced a magnetic field that shielded the surface from harmful solar and cosmic radiation, a much thicker atmosphere being replenished from active volcanism, and flowing liquid water, all of which potentially led to the existence of some forms of life on the surface.

However, given Mars’ small size (half of Earth), this means its internal heat cooled off much faster (possibly over millions of years), resulting in volcanism becoming inactive and the dissipation of the magnetic field the interior activity was driving, the latter of which led to harmful solar and cosmic radiation stripping the atmosphere, with the surface liquid water evaporating to space along with it. Therefore, do Dr. Young and Dr. Swindle believe life ever existed on Mars, and will we ever find it?

Dr. Young tells Universe Today, “I really don’t know.  I think microbial life sometime in the past, or even now, is a reasonable hypothesis but we don’t have enough information.”

Dr. Swindle also echoes his uncertainty whether life ever existed on Mars, but elaborates by telling Universe Today, “If there hasn’t, why did life start so early on Earth, but didn’t start on Mars, which had a similar climate at the time. If there has been, how similar is it to life on Earth? Since Earth and Mars are always exchanging rocks because of impacts, is life on Earth related to life on Mars? If it has existed, it will be tough to find. But an atmospheric sample could help. For instance, there seems to be methane in the Martian atmosphere. Most, but not all, of the methane in Earth’s atmosphere is biological, and analyzing the relative ratios of the isotopes of carbon or hydrogen is one of the best ways to figure that out.”

When will we obtain an atmospheric sample of Mars and what will it teach us about the formation and evolution of the Red Planet in the coming years and decades? Only time will tell, and this is why we science!

• As always, keep doing science & keep looking up!

{ https://www.universetoday.com/ }

01-06-2024 om 14:42 geschreven door peter  

POSTED BY CAROLYN COLLINS PETERSEN

Io Has Been Volcanically Active for its Entire History

Jupiter’s moon Io is a volcanic powerhouse. It’s the most geologically active world in the Solar System, sporting more than 400 spouting volcanoes and vents on its surface. Has it always been this way? A team of planetary scientists says yes, and they have the chemical receipts to prove it.

In a recent paper, the team headed by CalTech scientist Katherine de Kleer cites data from millimeter observations of elemental isotopes found in Io’s eruptions. They found that chemicals like chlorine and sulfur exist in higher quantities at Io than in comparable places in the Solar System. Analysis shows that Io hasn’t just started erupting lately—it’s been going on for most of its history. And, it’s so volcanic that it practically resurfaces itself every million years or so.

The discovery of volcanism on Io was one of the major results of the Voyager mission. As the two spacecraft swept past Jupiter in 1979, their images revealed Io’s volcanic features and plumes. Since that time, the Galileo, Cassini-Huygens, New Horizons, and Juno missions also sent images. The Jovian system and its moons are also frequent targets for ground- and space-based observatories, including Hubble Space Telescope and JWST.

Facts about Io

Io is the fourth-largest Jovian moon and is one of the four Galilean satellites. It orbits closest to Jupiter and gets pulled by a gravitational tug-of-war between Jupiter and the other Galilean moons. The result is a process called “tidal heating” deep inside Io, produced by friction. That generates heat, which melts Io’s interior, and opens up vents so that the heat and melted material can escape to the surface.

This little moon is mostly silicate rock atop an iron or iron sulfide core. The surface is scarred with volcanoes and deformed by compressional forces beneath the crust. The most obvious features are the volcanic mountains, plumes, and lava flows. Currently, Io’s volcanoes resurface the landscape at a rate of about 0.1 to 1.0 cm per year. They also paint its surface in an amazing array of colors. During the Voyager 2 flyby, people often compared its appearance to a pizza. The colors come mainly from sulfur and sulfurous compounds deposited across the landscape.

Normally, geologists would look at its surface and count craters to get an idea of its age. But, since volcanic flows erase craters, there’s no easy visual way to determine how long volcanic features have been around. However, it turns out that abundances of certain isotopes of sulfur and other elements could provide a good record the history of volcanism on Io.

Analyzing Io’s Chemistry

Io has probably lost mass to space throughout its history. de Kleer and her colleagues point out that its supply of volatile elements should be highly enriched in heavy stable isotopes. That’s because atmospheric escape processes generally favor the loss of lighter isotopes. They suggest that stable isotope measurements of volatile elements, such as sulfur and chlorine, could give accurate details about the history of volcanism at Io. So, it makes sense, then, to do a thorough chemical analysis of Io’s volcanic emissions now and extrapolate back.

Understanding Io’s current chemistry, requires, among other things, a good idea of its mass-loss history. Io’s mass loss occurs because of collisions between atmospheric molecules and energetic particles trapped in Jupiter’s magnetosphere. If this continued over Io’s history, then its chemistry should provide evidence of the volcanic past. In their paper, the team discusses the assumptions they made, including estimates of Io’s initial inventory of sulfur, as well as possible early mass-loss rates that could affect its current abundances of sulfur and chlorine—two elements that help determine past and present volcanism.

To get that history, team used the Atacama Large Millimeter Array to observe gases in Io’s atmosphere. The goal was to measure SO2, SO, NaCl, and KCl in various forms and determine the ratios of ³⁴S to ³²S and ³⁷Cl to ³⁵Cl. After analyzing the data, the team found that Io has lost at least 94 to 99 percent of its available sulfur over time. In addition, the measurements show enriched levels of chlorine. This probably indicates that Io has been volcanically active throughout time. It’s also possible that this tiny moon has experienced higher rates of outgassing and mass loss early in its history. More measurements should help scientists constrain Io’s volcanic activity even more tightly.

For More Information

• Isotopic Evidence of Long-lived Volcanism on I
• Violent Volcanoes Have Wracked Jupiter’s Moon Io for Billions of Years

{ https://www.universetoday.com/ }

01-06-2024 om 01:45 geschreven door peter  

POSTED BY MATT WILLIAMS

Pluto Has an Ocean of Liquid Water Surrounded by a 40-80 km Ice Shell

On July 14th, 2015, the New Horizons spacecraft conducted the first-ever flyby of Pluto, which once was (and to many, still is) the ninth planet of the Solar System. While the encounter was brief, the stunning images and volumes of data it obtained revealed a stunningly vibrant and dynamic world. In addition to Pluto’s heart, floating ice hills, nitrogen icebergs, and nitrogen winds, the New Horizons data also hinted at the existence of an ocean beneath Pluto’s icy crust. This effectively made Pluto (and its largest moon, Charon) members of the “Ocean Worlds” club.

Almost a decade after that historic encounter, scientists are still making discoveries from New Horizons data. In a new paper, planetary scientists Alex Nguyen and Dr. Patrick McGovern used mathematical models and images to learn more about the possible ocean between Pluto’s icy surface and its silicate and metallic core. According to their analysis, they determined that Pluto’s ocean is located beneath a surface shell measuring 40 to 80 km (25 to 50 mi), an insulating layer thick enough to ensure that an interior ocean remains liquid.

Nguyen is a graduate student in Earth, environmental, and planetary sciences in Arts & Sciences at Washington University in St. Louis (WUSTL), while Dr. McGovern is a Senior Staff Scientist with the Lunar and Planetary Institute (LPI) in Houston. Their paper, “The role of Pluto’s ocean’s salinity in supporting nitrogen ice loads within the Sputnik Planitia basin,” recently appeared in the journal Icarus. The study is part of Nguyen’s Ph.D. research at Washington University, where he is an Olin Chancellor’s Fellow and a National Science Foundation Graduate Research Fellow.

For decades, planetary scientists assumed Pluto was far too cold to support an interior ocean. Pluto orbits well beyond the Solar System’s “Frost Line,” the boundary beyond which volatile elements (water, carbon dioxide, ammonia, etc.) become solid. With an average surface temperature of -229 °C (-380°F), even nitrogen and methane become as solid as rock. As Nguyen indicated in a recent interview with The Source (WUSTL’s news site), “Pluto is a small body. It should have lost almost all of its heat shortly after it was formed, so basic calculations would suggest that it’s frozen solid to its core.”

But thanks to New Horizons, scientists were presented with multiple lines of evidence that suggest Pluto likely has an interior ocean. This includes cryovolcanoes, such as those observed on Ceres, Europa, Ganymede, Enceladus, Titan, Triton, and other “Ocean Worlds.” While the existence of this ocean is still subject to debate, the theory is gaining acceptance to the point that it is considered a very real possibility. For their study, Nguyen and McGovern created mathematical models to explain the cracks and bulges in the ice covering Pluto’s Sputnik Planitia Basin.

Their results indicate that an ocean could exist beneath an icy shell 40 to 80 km (25 to 50 mi) thick, which would be sufficient to ensure that Pluto could maintain a liquid water ocean in its interior despite surface conditions. They also calculated the likely density or salinity of the ocean based on the surface features and determined that Pluto’s ocean could be up to 8% denser than Earth’s oceans. This salinity level would make Pluto’s ocean comparable to the Great Salt Lake, the Dead Sea, and other high-salinity bodies of water on Earth.

According to Nguyen, any variations in this density (greater or lower) would be evident from the cracks and fractures in the Sputnik Platina Basin. “We estimated a sort of Goldilocks zone where the density and shell thickness is just right,” he said. If the ocean were less dense, the ice shell would collapse, leading to many more fractures in the surface. If it were denser, the ice sheet would be more buoyed, which would be evident from there being fewer fractures. Unfortunately, it could be many decades before another spacecraft reaches Pluto to help confirm these findings. In the meantime, the case for Pluto’s interior ocean grows stronger!

Further Reading:

•  Washington University at St. Louis, Icarus

{ https://www.universetoday.com/ }

01-06-2024 om 01:37 geschreven door peter  

For the study, the researchers investigated water management requirements for a 100-person self-sustaining lunar base measured at 500 m x 100 x 6 m (1640 ft x 328 ft x 20 ft), including the location of the lunar base near water ice deposits, the technology required to convert the water ice to water vapor (since liquid water can’t exist on the Moon), and the technology required for water treatment and recovery that would result in safe consumption for the 100-person base. The study used the current water usage estimates for American households, which is approximately 100 gallons per day (GPD) per person, which includes cleaning, cooking, drinking, flushing toilets, and washing clothes.

Additionally, the researchers examined the amount of water required for agricultural, technical, and overall needs for the lunar base. Regarding the location of the lunar base, the researchers deduced that the best location for the base would be either near, or exactly on, the Shackleton-de Gerlache Ridge, which is located at 89.9°S 0.0°E, or almost directly on the lunar south pole. The reason this location is ideal for water ice deposits is because Shackleton Crater resides within a permanently shadowed region (PSR), meaning it is shrouded in permanent darkness due to the Moon’s small axial tilt, and water ice has potentially built up over billions of years.

In the end, the team concluded the water requirements for the 100-person lunar base for human, agricultural, and technical needs are 12.3, 72, and 2 acre-feet per year. For context, one acre-foot is equivalent to approximately 326,000 gallons, so a 100-person lunar base would need more than 4,000,000 gallons per year for human needs, more than 23,000,000 gallons per year for agricultural needs, and 652,000 gallons per year for technical needs. So, based on these findings, what were the most significant results from this study, and what follow-up studies are currently in the works or being planned?

Dr. Lee tells Universe Today, “There is good evidence that sufficient water exists on the Moon to support a permanent lunar colony, and the acquisition, treatment, and distribution of the lunar water can be achieved with current technology. An appropriate administrative structure will be necessary to oversee all aspects of lunar water. The relative scarcity and management of water on the Moon can potentially provide insight for improving the management of water on Earth. The next study for my group will be to investigate the ways in which the management of lunar water could help to improve terrestrial water management. However, the timeline for this research is yet to be determined.”

The study discusses in-situ resource utilization (ISRU), which is using available, on-site resources for both sustainability and survivability. In this case, using water ice deposits on the Moon, and specifically near the south pole of the Moon, to meet the water needs of a 100-person, self-sustaining lunar base. The potential for NASA using ISRU has gained considerable traction in the last few years since sending water from the Earth to the Moon could prove to be extremely costly. But aside from the financial risks, if a resupply mission gets delayed or fails on the way to the Moon, the crew could face significant danger. Therefore, learning to “live off the land” for a lunar base could prove to be a viable, long-term option for mitigating the need of resupply missions from Earth. But what additional importance could a self-sustaining moonbase also provide?

Dr. Lee tells Universe Today, “Over the years, there has been a groundswell of excitement at the prospect of colonizing Mars. Indeed, at present, we are conceivably able to mount a short-term human voyage to the Red Planet in which the astronauts would collect samples, conduct experiments, plant flags, and when the next launch window occurs, return to Earth. However, the permanent colonization of Mars is much more ambitious and challenging. Mars is much farther away than the Moon, requiring 9 months to get there and a round trip time of 21 months (a 3-month stay on Mars is needed until the next launch window arrives).”

NASA’s goal is to send humans to Mars through the agency’s Moon to Mars Architecture, which is an elaborate, years-long endeavor to develop the necessary technologies on the Moon for use during a crewed mission to the Red Planet. This includes science, infrastructure, transportation, habitation, and operations, just to name a few. However, as noted, while we can (possibly) send humans to the Red Planet for short-term stays with our current technology, a long-term human presence on Mars would require significantly more time and resources.  

Dr. Lee tells Universe Today, “Beyond low Earth orbit, the Moon is a logical next destination. Lunar colonization is technologically achievable, and in comparison to Martian colonization, it is far easier. Being capable of establishing a moonbase seems like an obvious prerequisite for establishing a Mars base. Furthermore, the Moon would be an excellent jumping off point for further Solar System colonization including potentially the eventual establishment of small colonies in the interiors of Near-Earth Asteroids. Additionally, some have suggested that the Moon is an ideal location from which the interception of Earth-bound asteroids could be conducted.”

This study comes as NASA’s Artemis program plans to land the first woman and person of color on the lunar surface in the next few years. The current landing sites of the Artemis missions are near the south pole to access nearby water ice deposits within the aforementioned PSRs and could be ideal to develop ISRU technologies that can also be used on future Mars crewed missions, as well. Therefore, what implications could this study have for the upcoming Artemis missions?

“Short term lunar visits, such as the planned Artemis missions would not require lunar water,” Dr. Lee tells Universe Today. “In these instances, sufficient water could be brought from Earth. However, if at some point in the future, a lunar colony were to become a priority, future Artemis missions could serve to provide valuable in situ information about the presence and abundance of lunar water, particularly at the lunar south pole and in proximity to the Shackleton Crater (an ideal area for a moonbase).”

How will water management play a role in a self-sustaining lunar base in the coming years and decades? Only time will tell, and this is why we science!

• As always, keep doing science & keep looking up!

{ https://www.universetoday.com/ }

01-06-2024 om 01:27 geschreven door peter  

The study, published in the journal Patterns, highlights the risks and challenges posed by this emerging behavior and calls for urgent action from policymakers and AI developers.

“AI developers do not have a confident understanding of what causes undesirable AI behaviors like deception,” Dr. Peter S. Park, the study’s lead author and an AI existential safety postdoctoral fellow at MIT, said in a press release. “But generally speaking, we think AI deception arises because a deception-based strategy turned out to be the best way to perform well at the given AI’s training task. Deception helps them achieve their goals.” 

The review meticulously analyzed various AI systems and found that many had developed deceptive capabilities due to their training processes. These systems ranged from game-playing AIs to more general-purpose models used in economic negotiations and safety testing environments.

One of the most striking examples cited in the study was Meta’s CICERO, an AI developed to play the game Diplomacy. Despite being trained to act honestly and maintain alliances with human players, CICERO frequently used deceptive tactics to win. 

This behavior included building fake alliances and backstabbing allies when it benefited its gameplay, leading researchers to conclude that CICERO had become a “master of deception.”​

“Despite Meta’s efforts, CICERO turned out to be an expert liar,” researchers wrote. “It not only betrayed other players but also engaged in premeditated deception, planning in advance to build a fake alliance with a human player to trick that player into leaving themselves undefended for an attack.”

Researchers found that other AI systems had developed the ability to cheat at different types of games. For instance, Pluribus, a poker-playing model created by Meta, demonstrated it could convincingly bluff in Texas hold ’em poker, successfully misleading professional human players about their hand strengths. 

In another example, AlphaStar, an AI system created by Google’s DeepMind to play the real-time strategy game Starcraft II, exploited the game’s “fog-of-war“ mechanics to feint attacks and deceive opponents to gain strategic advantages. 

“While it may seem harmless if AI systems cheat at games, it can lead to breakthroughs in deceptive AI capabilities that can spiral into more advanced forms of AI deception in the future,“ Dr. Park explained.

Indeed, during their review, researchers found that some AI systems had already learned methods of deception that extend far beyond the realm of games. 

In one instance, AI agents had learned to “play dead“ to avoid being detected by a safety test designed to eliminate faster-replicating AI variants. Such behavior can create a false sense of security among developers and regulators, potentially leading to severe consequences if these deceptive systems are deployed in real-world applications​​.

Another AI system trained on human feedback was found to have taught itself how to behave in ways that earned positive scores by tricking human reviewers into thinking an intended goal had been accomplished. 

The potential risks of AI deception are significant and multifaceted. Researchers note that in the near term, these systems could be used by malicious actors to commit fraud, manipulate financial markets, or interfere with elections. 

Moreover, as AI capabilities advance, there is an increasing concern among experts that humans may not be able to control these systems, posing existential threats to society.

Researchers call for robust regulatory frameworks and proactive measures to address these risks. This includes classifying deceptive AI systems as high risk, mandating transparency in AI interactions, and intensifying research into methods for detecting and preventing AI deception. 

While some progress has been made, such as the EU AI Act and President Joe Biden’s Executive Order on AI safety, enforcing these policies remains challenging due to the rapid pace of AI development and the lack of reliable techniques to manage these systems effectively​. 

Researchers argue that AI developers should be legally required to delay the deployment of AI systems until they are demonstrated to be trustworthy by reliable safety tests. Additionally, the deployment of new systems should be gradual so that emerging risks from deception can be properly assessed and mitigated. 

The study authors also stressed the importance of understanding why and how AI systems learn to deceive. Without this knowledge, creating adequate safeguards and ensuring that AI technologies benefit humanity without undermining trust and stability will be challenging.

As AI continues to evolve, the need for vigilance and proactive regulation becomes ever more critical. The findings of this review serve as a stark reminder of the potential dangers lurking within advanced AI systems and the urgent need for comprehensive strategies to mitigate these risks.

“Proactive solutions are needed, such as regulatory frameworks to assess AI deception risks, laws requiring transparency about AI interactions, and further research into detecting and preventing AI deception,“ researchers concluded. “Proactively addressing the problem of AI deception is crucial to ensure that AI acts as a beneficial technology that augments rather than destabilizes human knowledge, discourse, and institutions.”

• Tim McMillan is a retired law enforcement executive, investigative reporter and co-founder of The Debrief. His writing typically focuses on defense, national security, the Intelligence Community and topics related to psychology. You can follow Tim on Twitter: @LtTimMcMillan.  Tim can be reached by email: tim@thedebrief.org or through encrypted email: LtTimMcMillan@protonmail.com 

{ https://thedebrief.org/category/tech/ }

01-06-2024 om 00:00 geschreven door peter  

We could float effortlessly in Pluto's subsurface ocean

Related: 

• Supervolcano eruption on Pluto hints at hidden ocean beneath the surface

Most strikingly, some scientists believe that Pluto holds cryovolcanoes that spew out water vapor or even solid water ice. That water has to come from somewhere — and a layer of liquid water beneath Pluto's crust would fit the description.

Researchers at Washington University in St. Louis and the Lunar and Planetary Institute in Houston set about constructing a model of what that liquid layer might look like. In particular, they wanted to match Sputnik Planitia — a heart-shaped lowland basin on Pluto's surface thought to be the aftermath of an impact. So, the researchers tried different configurations of ocean thickness and water density that would result in the Sputnik Planitia criss-crossed with cracks that New Horizons observed.

"We estimated a sort of Goldilocks zone where the density and shell thickness is just right," said Alex Nguyen, a graduate student at Washington University in St Louis and one of the authors, in a statement.

Their calculations indicated that a Plutonian ocean would most likely be around 25 to 50 miles (40 to 80 kilometers) thick, and about 8 percent denser than Earth seawater. That is about as dense as the Great Salt Lake. 

But the idea of a Plutonian ocean is still controversial. Scientists don't know enough about Pluto to know if the evidence really points to liquid water or if it's just circumstantial. Most recently, a study simulating the origin of Sputnik Planitia suggested that the heart-shaped basin was most likely to have formed if Pluto had a solid interior.

So, until a successor to New Horizons lets us revisit Pluto, what lies beneath the world's surface will remain cloaked in shadow.

Nguyen and co-author Patrick McGovern published their work in the journal Icarus on February 15.

{ https://www.space.com/ }

31-05-2024 om 23:30 geschreven door peter  

James Webb Space Telescope spots the most distant galaxy ever seen (image)

Related: 

• James Webb Space Telescope spots 3 of our universe's earliest galaxies

The announcement of the discoveries, made in Oct. 2023 and Jan. 2024, are the latest developments in the ongoing investigation of cosmic dawn that the $10 billion telescope has facilitated as part of the JWST Advanced Deep Extragalactic Survey (JADES) program. JADES aims to provide vital insights into the ways in which the stars, gas, and black holes were evolving in primordial galaxies when the 13.8 billion-year-old universe was very young. 

"These galaxies join a small but growing population of galaxies from the first half billion years of cosmic history where we can really probe the stellar populations and the distinctive patterns of chemical elements within them," team member and Kavli Institute for Cosmology scientist Francesco D’Eugenio said in a statement.

JADES-GS-z14-0 isn't just remarkable for how distant it is from Earth and how early it existed in the cosmos, though. With a width of around 1,600 light-years across, this "cosmic dawn" galaxy is also remarkable for how big and bright it is.

"The size of the galaxy clearly proves that most of the light is being produced by large numbers of young stars, rather than material falling onto a supermassive black hole in the galaxy's center, which would [make it] appear much smaller, "JADES team leader Daniel Eisenstein from the Harvard & Smithsonian's Center for Astrophysics (CfA) said in a separate statement. 

The extreme brightness of JADES-GS-z14-0 and the fact this luminosity is powered by young stars means this galaxy represents the most striking evidence for the rapid formation of large, massive galaxies in the early universe found thus far.

JADES team member and University of California-Santa Cruz researcher Ben Johnson added that JADES-GS-z14-0 shows that galaxy formation in the early universe was very rapid and intense. 

"The JWST will allow us to find more of these galaxies, perhaps when the universe was even younger," he said. "It is a marvelous opportunity to study how galaxies get started."

The James Webb Space Telescope sees red to spot early galaxies

The JWST is adept at seeing early galaxies thanks to the high infrared sensitivity of its instruments, particularly its primary imager, the Near Infrared Camera (NIRCam). 

Light leaves these cosmic dawn galaxies with a wide range of wavelengths similar to light from galaxies that are closer to the Milky Way. It is the journey of billions of years that transforms this light into low-energy and long-wavelength light in the near-infrared and infrared regions of the electromagnetic spectrum.

The very fabric of space is expanding, and as light passes through it, its wavelength is stretched along with it. This causes the light to "shift" down to the red end of the electromagnetic spectrum, hence the name for this phenomenon, "redshift."

Galaxies that are farther away have to cross more space (which is being stretched as it expands) before their light reaches us, and thus, that light experiences more redshift. Redshift, denoted as z, can, therefore, be used to measure the distance to celestial objects with a known spectrum. And because light takes a finite amount of time to travel, this distance can be used to calculate how long ago these galaxies existed as we see them.

JADES-GS-z14-0 has a redshift of z = 14.32, while the previous most distant galaxy, JADES-GS-z13-0, has a redshift of z = 13.2, which placed it as existing 400 million years after the Big Bang. Clearly, this newly found galaxy has absolutely smashed that record, with the JWST seeing back in time by another 100 million years or so.

"JADES-GS-z14-0 now becomes the archetype of this phenomenon," JADES collaboration team member Stefano Carniani of the Scuola Normale Superiore said. "It is stunning that the universe can make such a galaxy in only 300 million years."

JADES-GS-z14-0 delived some surprises

Not everything about JADES-GS-z14-0 was immediately clear to the JADES team and some elements could confuse our picture of the early cosmos.

When it was first spotted, the primordial galaxy was so close to a closer foreground galaxy that the team suspected they could be celestial neighbors.  This idea was dispelled in October last year when the JADES crew spent five days performing a deep analysis of JADES-GS-z14-0 with NIRCam. The application of filters that are specifically tailored to identify early galaxies confirmed the extreme distance to JADES-GS-z14-0.

"We just couldn’t see any plausible way to explain this galaxy as being merely a neighbor of the more nearby galaxy," JADES team member and University of Arizona researcher Kevin Hainline said.

The galaxy also surprised its discoverers because its light is even redder than expected. That is because the light from JADES-GS-z14-0 is being "reddened" by dust within it that will become the building blocks of stars that will help this galaxy grow even larger.

Another surprise was the discovery of oxygen in JADES-GS-z14-0. Elements heavier than hydrogen and helium are forged by stars during their lifetimes and then distributed through galaxies when these stars explode. The observation of oxygen in JADES-GS-z14-0 could indicate that at least one generation of stars has already lived and died in this very early galaxy.

"All of these observations, together, tell us that JADES-GS-z14-0 is not like the types of galaxies that have been predicted by theoretical models and computer simulations to exist in the very early universe,"  JADES researcher Jake Helton of Steward Observatory and the University of Arizona said. "Given the observed brightness of the source, we can forecast how it might grow over cosmic time, and so far, we have not found any suitable analogs from the hundreds of other galaxies we’ve observed at high redshift in our survey."

Helton added that given the relatively small region of the sky that the JWST searched to find JADS-GS-z14-0, its discovery has profound implications for the predicted number of bright galaxies we see in the early universe.

"It is likely that astronomers will find many such luminous galaxies, possibly at even earlier times, over the next decade with the JWST," he concluded. "We're thrilled to see the extraordinary diversity of galaxies that existed at cosmic dawn!”

{ https://www.space.com/ }

31-05-2024 om 23:14 geschreven door peter  

While previous studies have revealed that Egyptians from these periods were able to identify, describe, and treat diseases and traumatic injuries, build prosthetics, and even place dental fillings, this study is the first to show that these surprisingly advanced ancient people may have tried to treat cancer around the same time they were building the pyramids.

“This finding is unique evidence of how ancient Egyptian medicine would have tried to deal with or explore cancer more than 4,000 years ago,” said Prof Edgard Camarós, a paleopathologist at the University of Santiago de Compostela and the study’s lead author. “This is an extraordinary new perspective in our understanding of the history of medicine.”

CUT MARKS ON 4,000-YEAR-OLD EGYPTIAN SKULL LEAVE RESEARCHERS STUNNED

To conduct their analysis, the researchers were able to procure two separate skulls that showed signs of cancerous lesions. The first, dubbed “Skull and mandible 236,” has previously been dated to between 2687 and 2345 BCE, while the second, “Skull E270,” has been dated to between 663 and 343 BCE. For comparison, the Great Pyramid of Giza is believed to have been built over a period of about 27 years, sometime around 2,600 BCE.

The skulls were examined using microscopic analysis and CT scanning.

Image: Tondini, Isidro, Camarós, 2024. CREDIT: Tondini, Isidro, Camarós, 2024.

When examining the roughly 30 small, metastasized lesions and one large lesion likely caused by neoplasm spread across Skull 236 under a microscope and also using a CT scanner, the researchers say they were “stunned” to discover something unexpected: clear cutmarks around a number of the lesions.

Cutmarks found on skull 236, probably made with a sharp object. Image: Tondini, Isidro, Camarós, 2024.

CREDIT: Tondini, Isidro, Camarós, 2024.

“When we first observed the cutmarks under the microscope, we could not believe what was in front of us,” said Tatiana Tondini, a researcher at the University of Tübingen and first author of the study.

In fact, according to Tondini, they weren’t even looking for things like cutmarks in the first place. “We wanted to learn about the role of cancer in the past, how prevalent this disease was in antiquity, and how ancient societies interacted with this pathology,” the researcher explained.

SIGNS ANCIENT EGYPTIAN MAY HAVE RECEIVED AND SURVIVED CANCER SURGERY

After finding evidence of cutmarks on the 4,000-year-old Egyptian Skull known as 236, the team performed a similar analysis of Skull E270. Like the older sample, E270 also had a large lesion the researchers described as “consistent with a cancerous tumor that led to bone loss.” However, unlike the other skull, this specimen had two smaller, “healed” lesions likely caused by traumatic injuries. Furthermore, one of the smaller lesions appears to be the result of a “close-range violent event” involving some sort of sharp instrument.

A closer analysis showed that this second lesion appeared to have healed after encountering a sharp object. Such a finding hints at the possibility that this person had surgery to remove cancer and then survived the treatment. “These healed lesions could mean that the individual potentially received some kind of treatment and, as a result, survived,” the press release announcing the study expl

Skull E270, dating from between 663 and 343 BCE, belonged to a female individual who was older than 50 years. Image: Tondini, Isidro, Camarós, 2024.

CREDIT: Tondini, Isidro, Camarós, 2024.

The researchers concede that the injury could be the result of combat. However, they also point out that E270 belonged to a roughly 50-year-old woman. In ancient Egypt, it was rare to find evidence of women in any form of combat, especially one of such an advanced age, meaning either answer could have the potential to rewrite the history books.

{ https://thedebrief.org/category/science/ }

31-05-2024 om 22:44 geschreven door peter  

Does This FBI Document Suggest That Nikola Tesla Was An Alien From Venus?

For more than half a century, incredible information about Nikola Tesla has been kept secret, and only recently the FBI declassified document revealed this data, which indicates that a cult scientist was once brought to Earth from Venus. Tesla’s mind was almost too great for the limitations of his time’s technology.

These things make it clear that Tesla was a remarkably intelligent man who was far ahead of his time. In fact, it has been said by many that his inventions were between 300 and 1,000 years ahead of time. If it were not for Tesla’s inventions, the world as we know it would be nearly half a century behind where we are today in terms of technological advancement. This has, understandably, led many to wonder about Tesla’s origins. Was he even from this planet?

According to information from the FBI documents, Nikola Tesla was an alien. In the archives of the FBI’s official website, there is a very mysterious document that contains a very unusual statement regarding Nikola Tesla. In addition, the declassified FBI dossier contained information about a certain George Washington Van Tassel, who was engaged in ufology and also worked on the Douglas, Hughes, and Lockheed planes in the 30s and 40s.

This declassified FBI document known as the “Interplanetary Sessions Newsletter“, written on June 14, 1957, seems to suggest that these notions may not be as unbelievable as they sound. In fact, this document seems to suggest that Tesla was originally from the planet Venus. It read in part:

“The Space People have visited the Tesla engineers many times, and have told us that Tesla was a Venusian, brought to this planet as a baby, in 1856, and left with Mr. and Mrs. Tesla in a remote mountain province in what is now Yugoslavia.”

Margaret Storm had been assigned to certain work with the Space People, as follows: She wrote a book – Return of the Dove – a story of the life of Nikola Tesla, a scientist, and the part his inventions played in the New Age. Much of the data for this book has been supplied to Mrs. Storm through transcripts received on the Tesla set, a radio-type machine invented by Tesla in 1938 for Interplanetary Communication.

Tesla died in 1943 and his engineers did not build the Tesla set until after his death. It was placed in operation in 1950 and since that time the Tesla engineers have been in close touch with space ships. The Space People have visited the Tesla engineers many times, and have told us that Tesla was a Venusian, brought to this planet as a baby, in 1856, and left with Mr. and Mrs. Tesla in a remote mountain province in what is now Yugoslavia.”

Additionally, Margaret Storm, a woman who was tasked with writing a book on Tesla’s remarkable life, was reportedly given information through a device that the scientist created in 1938 that was said to allow for “interplanetary communication”. Allegedly, Storm even had contact with these so-called “Space People”. In an interview in May of 1959, Storm reported that Tesla was a Venusian saying:

“Tesla was born onboard a spacecraft and brought to this planet… and placed in the care of Mr. & Mrs. Tesla.”

Storm claimed that Tesla was frequently in contact with his fellow Venusians, even visiting him from time to time. In the interview, she states that Tesla had many visitors who arrived in spaceships and that “most of them have come from Venus”.

According to the “Interplanetary Sessions Newsletter”, Margaret Storm had been “assigned to certain work with the Space People as follows: She is writing a book- Return of the Dove- a story of the life of Nikola Tesla, scientist, and the part his inventions will play in the new age”. Further, much of the information that Storm used to complete her book was given to her through communication with the Space People. The now-declassified FBI document goes on to say:

“Much of the data for this book has been supplied to Mrs. Storm through transcripts received on the Tesla set, a radio-type machine invented by Tesla in 1943 and his engineers did not build the Tesla set until after his death. It was placed in operation in 1950 and since that time the Tesla engineers have been in close touch with space ships.”

Read also:

• Black US Soldier Was Abducted by Three Alien Species And Visited Grey Aliens Planet
• Italian Man Took Photos Of Aliens From Planet Clarion, Located 150,000 light-years From Earth
• Chinese Man Mated With 10-Foot Tall Alien For 40 Minutes While Hovering Above His Sleeping Wife

• Alien Abducted Irish Man And Told Him The World Would END in 850 Years

{ https://www.howandwhys.com/ }

31-05-2024 om 22:17 geschreven door peter  

Rare 'exo-Venus' with Earth-like temperature discovered

Gliese 12 b, which orbits a cool, red dwarf star located just 40 light-years away, promises to tell astronomers more about how planets close to their stars retain or lose their atmospheres. In this artist’s concept, Gliese 12 b is shown retaining a thin atmosphere.

Credit NASA/JPL-Caltech/R. Hurt (Caltech-IPAC)

Licence type

Attribution (CC BY 4.0)

Astronomers have made the rare and tantalising discovery of an Earth-like exoplanet 40 light-years away that may be just a little warmer than our own world.

The potentially-habitable planet, named Gliese 12 b, orbits its host star every 12.8 days, is comparable in size to Venus - so slightly smaller than Earth - and has an estimated surface temperature of 42°C (107°F), which is lower than most of the 5,000-odd exoplanets confirmed so far.

That is assuming it has no atmosphere, however, which is the crucial next step to establishing if it is habitable.

It may have an Earth-like atmosphere, one more akin to Venus - which experienced a runaway greenhouse effect that made it a 400°C (752°F) hellhole - no atmosphere, or perhaps a different kind of atmosphere not found in our solar system.

Getting an answer is vital because it would reveal if Gliese 12 b can maintain temperatures suitable for liquid water - and possibly life - to exist on its surface, while also unlocking answers about how and why Earth and Venus evolved so differently.

Gliese 12 b is by no means the first Earth-like exoplanet to have been discovered, but as NASA has said, there are only a handful of worlds like it that warrant a closer look.

It has been billed as "the nearest, transiting, temperate, Earth-size world located to date" and a potential target for further investigation by the US space agency's £7.5billion James Webb Space Telescope.

The closest Earth-like exoplanet to us - and possibly the most famous - is Proxima Centauri b, which is only 4 light-years away. However, because it is not a transiting world we still have a lot to learn about it, including whether it has an atmosphere and the potential to harbour life.

Most exoplanets are discovered using the transit method, where a planet passes in front of its star from our point of view, causing a dip in the host star's brightness.

During a transit, the star's light also passes through an exoplanet's atmosphere and some wavelengths get absorbed. Different gas molecules absorb different colours, so the transit provides a set of chemical fingerprints that can be detected by telescopes like Webb.

Gliese 12 b’s estimated size may be as large as Earth or slightly smaller — comparable to Venus in our solar system. This artist’s concept compares Earth with different possible Gliese 12 b interpretations, from one with no atmosphere to one with a thick Venus-like one.

NASA/JPL-Caltech/R. Hurt (Caltech-IPAC)

Licence type

Attribution (CC BY 4.0)

Gliese 12 b could also be significant because it may help reveal whether the majority of stars in our Milky Way galaxy - i.e. cool stars - are capable of hosting temperate planets that have atmospheres and are therefore habitable.

The discovery of the 'exo-Venus', by two international teams of astronomers, has been published today in the Monthly Notices of the Royal Astronomical Society.

It orbits a cool red dwarf star called Gliese 12, which is almost 40 light-years away from Earth in the constellation Pisces.

"Gliese 12 b represents one of the best targets to study whether Earth-size planets orbiting cool stars can retain their atmospheres, a crucial step to advance our understanding of habitability on planets across our galaxy," said Shishir Dholakia, a doctoral student at the Centre for Astrophysics at the University of Southern Queensland in Australia.

He co-led a research team with Larissa Palethorpe, a doctoral student at the University of Edinburgh and University College London.

The exoplanet's host star is about 27 per cent of the size of our Sun and has a surface temperature that is around 60 per cent of our own star.

However, the distance separating Gliese 12 and the new planet is just 7 per cent of the distance between Earth and the Sun. Gliese 12 b therefore receives 1.6 times more energy from its star as Earth does from the Sun and about 85 per cent of what Venus experiences.

This difference in solar radiation is important because it means the planet's surface temperature is highly dependent on its atmospheric conditions. As a comparison to Gliese 12 b's estimated surface temperature of 42°C (107°F), Earth has an average surface temperature of 15°C (59°F).

"Atmospheres trap heat and - depending on the type - can change the actual surface temperature substantially," Dholakia explained. "We are quoting the planet's 'equilibrium temperature', which is the temperature the planet would be if it had no atmosphere.

"Much of the scientific value of this planet is to understand what kind of atmosphere it could have. Since Gliese 12 b gets in between the amount of light as Earth and Venus get from the Sun, it will be valuable for bridging the gap between these two planets in our solar system."

Palethorpe added: "It is thought that Earth's and Venus's first atmospheres were stripped away and then replenished by volcanic outgassing and bombardments from residual material in the solar system.

"The Earth is habitable, but Venus is not due to its complete loss of water. Because Gliese 12 b is between Earth and Venus in temperature, its atmosphere could teach us a lot about the habitability pathways planets take as they develop."

The closest Earth-like exoplanet to us - and possibly the most famous - is Proxima Centauri b (pictured in an artist's impression), which is only 4 light-years away. However, because it is not a transiting world we still have a lot to learn about it, including whether it has an atmosphere and the potential to harbour life.

NASA Visualization Technology Applications and Development (VTAD)

Licence type

Attribution (CC BY 4.0)

The researchers, along with another team in Tokyo, used observations by NASA's TESS (Transiting Exoplanet Survey Satellite) to help make their discovery.

"We've found the nearest, transiting, temperate, Earth-size world located to date," said Masayuki Kuzuhara, a project assistant professor at the Astrobiology Center in Tokyo, who co-led a research team with Akihiko Fukui, a project assistant professor at the University of Tokyo.

"Although we don't yet know whether it possesses an atmosphere, we've been thinking of it as an exo-Venus, with similar size and energy received from its star as our planetary neighbour in the solar system."

An important factor in retaining an atmosphere is the storminess of its star. Red dwarfs tend to be magnetically active, resulting in frequent, powerful X-ray flares.

However, analyses by both teams conclude that Gliese 12 shows no signs of such extreme behaviour, raising hopes that Gliese 12 b's atmosphere may still be intact.

"We know of only a handful of temperate planets similar to Earth that are both close enough to us and meet other criteria needed for this kind of study, called transmission spectroscopy, using current facilities," said Michael McElwain, a research astrophysicist at NASA's Goddard Space Flight Center in Greenbelt, Maryland, and a co-author of the Kuzuhara and Fukui paper.

"To better understand the diversity of atmospheres and evolutionary outcomes for these planets, we need more examples like Gliese 12 b."

At 40 light-years from Earth, Gliese 12 b is about the same distance as the TRAPPIST-1 system.

This is made up of seven planets, all roughly in Earth's size range and likely rocky, orbiting a red dwarf star.

Three of these are in the habitable zone but at least two - and probably all of them - have no atmosphere and are likely barren, dismissing hopes when they were first discovered eight years ago that they could be water worlds hosting life.

• The new paper "Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS", Shishir Dholakia and Larissa Palethorpe et al., has been published in the Monthly Notices of the Royal Astronomical Society.

{ https://ras.ac.uk/ }

31-05-2024 om 20:54 geschreven door peter  

De planeet heeft een geschatte oppervlaktetemperatuur van slechts 42 graden Celsius en bevindt zich op ongeveer dezelfde afstand als het bekende TRAPPIST-1 systeem.

Al jaren speuren astronomen het universum af naar planeten die mogelijk leven kunnen ondersteunen of op zijn minst bewoonbaar zijn, in de hoop werelden te vinden die op de aarde lijken. En een nieuwe ontdekking heeft nu voor grote opwinding gezorgd. Op zo’n 40 lichtjaar afstand zijn onderzoekers namelijk op de veelbelovende planeet Gliese 12 b gestuit. Zou dit de planeet kunnen zijn waar we al zo lang naar op zoek zijn?

Gliese 12 b
De mogelijk bewoonbare planeet Gliese 12 b draait elke 12,8 dagen om zijn moederster. Qua grootte is de exoplaneet vergelijkbaar met Venus, wat betekent dat hij slechts iets kleiner is dan de aarde. Daarnaast heeft deze aardachtige planeet ook nog eens een aardachtige temperatuur. Zo wordt de oppervlaktetemperatuur geschat op 42 graden Celsius. Hiermee is hij iets warmer dan de aarde, maar opvallend koeler dan de meeste van de ongeveer 5.000 tot nu toe ontdekte exoplaneten. De ontdekking van deze ‘exo-Venus’, is vandaag gepubliceerd in de Monthly Notices of the Royal Astronomical Society.

Exo-Venus
Onderzoekers kwamen de veelbelovende planeet op het spoor met behulp van planetenjager TESS, die al heel wat exoplaneten aan het licht heeft gebracht. En onderzoekers zijn enthousiast. “We hebben de dichtstbijzijnde, gematigde wereld ter grootte van de aarde tot nu toe ontdekt,” benadrukt onderzoeker Masayuki Kuzuhara. “Hoewel we nog niet weten of Gliese 12 b een atmosfeer heeft, beschouwen we ‘m als een ‘exo-Venus’. Het heeft een vergelijkbare grootte en ontvangt een vergelijkbare hoeveelheid energie van zijn ster als onze buurplaneet in ons eigen zonnestelsel.”

Atmosfeer
Om er echter zeker van te zijn dat de planeet leefbaar is, is het van cruciaal belang om te bepalen of er wel of geen atmosfeer aanwezig is. Het is mogelijk dat de planeet een atmosfeer heeft die vergelijkbaar is met die van de aarde. Deze kan echter ook meer lijken op die van Venus, waar een omvangrijk broeikaseffect ervoor zorgde dat het oppervlak een verzengende 400 graden Celsius bereikte. Een andere mogelijkheid is dat de planeet geen atmosfeer heeft. Of misschien heeft ie wel een soort atmosfeer die we nog niet in ons eigen zonnestelsel hebben gezien. Het is erg belangrijk om hierop een antwoord te krijgen omdat het ons zal vertellen of Gliese 12 b temperaturen kan handhaven die geschikt zijn voor vloeibaar water – en mogelijk leven – op het oppervlak.

Moederster
Om dit te achterhalen, is ook de moederster relevant. De moederster van Gliese 12 b is een koele rode dwergster genaamd Gliese 12, die zich zoals gezegd op bijna 40 lichtjaar afstand van de aarde bevindt, in het sterrenbeeld Vissen. De ster is ongeveer 27 procent zo groot als onze zon en heeft een oppervlaktetemperatuur van ongeveer 60 procent van die van onze zon. Over rode dwergsterren is echter bekend dat het ‘opvliegende’ sterren zijn, die vaak magnetisch actief zijn. Dit resulteert in frequente, krachtige uitbarstingen, waardoor een mogelijk rondom cirkelende planeet van zijn atmosfeer wordt ontdaan. Toch lijkt Gliese 12 b er beter vanaf te komen. Analyses hebben namelijk aangetoond dat Gliese 12 geen tekenen vertoont van dergelijk extreem gedrag. Dit verhoogt de hoop dat de potentiële atmosfeer van Gliese 12 b nog steeds intact is.

Oppervlaktetemperatuur

Daarnaast is de afstand tussen Gliese 12 en de nieuw ontdekte planeet slechts 7 procent van de afstand tussen de aarde en de zon. Hierdoor ontvangt Gliese 12 b 1,6 keer meer energie van zijn ster dan de aarde van de zon, en ongeveer 85 procent van de hoeveelheid die Venus ontvangt. Dit verschil in de hoeveelheid zonnestraling die de planeet ontvangt, is van groot belang omdat het aangeeft dat de oppervlaktetemperatuur sterk wordt beïnvloed door de atmosferische omstandigheden. Voor je beeldvorming: de geschatte oppervlaktetemperatuur van Gliese 12 b is 42 graden Celsius, terwijl de gemiddelde oppervlaktetemperatuur van de aarde 15 graden Celsius bedraagt. “Atmosferen houden warmte vast en kunnen, afhankelijk van hun samenstelling, de werkelijke oppervlaktetemperatuur aanzienlijk beïnvloeden,” legt onderzoeker Shishir Dholakia uit.

Aarde en Venus
Het onderzoek naar Gliese 12 b heeft overigens niet alleen betrekking op de leefbaarheid van deze planeet. Het helpt ons ook om meer te weten te komen over waarom de aarde en Venus, die in veel opzichten erg op elkaar lijken, toch zo’n andere weg zijn ingeslagen. “Omdat Gliese 12 b een vergelijkbare hoeveelheid licht ontvangt als de aarde en Venus van de zon, kan het ons ook helpen om het verschil tussen deze twee planeten in ons eigen zonnestelsel te verklaren en te begrijpen,” aldus Dholakia. Dit kan waardevolle inzichten bieden in de atmosferische processen die de leefbaarheid van planeten beïnvloeden. Terwijl de aarde bewoonbaar is, is Venus dat niet, voornamelijk vanwege het volledige verlies van water. “Gliese 12 b, met een temperatuur tussen die van de aarde en Venus in, kan ons helpen begrijpen hoe planeten bewoonbaar worden, vooral door te kijken naar welke atmosfeer het heeft,” vertelt mede-auteur Larissa Palethorpe.

Onderzoek naar de veelbelovende exo-Venus gaat onverminderd door. Want het idee dat deze planeet mogelijk leefbaar is, prikkelt de verbeelding van menig astronoom. Gliese 12 b is zeker niet de eerste aardachtige exoplaneet die is ontdekt, maar volgens NASA zijn er maar een paar van zulke werelden die de moeite van nader onderzoek waard zijn. De volgende stap is om de krachtige ruimtetelescoop James Webb op Gliese 12 b te richten. Uiteindelijk hopen onderzoekers te achterhalen of deze planeet al dan geen atmosfeer herbergt. “Gliese 12 b vertegenwoordigt een van de beste doelen om te bestuderen of aardachtige planeten die om koele sterren draaien hun atmosferen kunnen behouden,” zegt Dholakia. “Dit is een cruciale stap om ons begrip van de bewoonbaarheid van planeten in ons sterrenstelsel te bevorderen.”

Bronmateriaal

• "Rare 'exo-Venus' with Earth-like temperature discovered" - Royal Astronomical Society.
  
• Afbeelding bovenaan dit artikel: NASA/JPL-Caltech/R. Hurt (Caltech-IPAC)

{ https://scientias.nl/ }

31-05-2024 om 20:41 geschreven door peter  

Nanoplastics nu ook op onverwachte plek in hart van foetus teruggevonden. En de kans is groot dat dat schadelijk is

Jeannette Kras

 

{ https://scientias.nl/ }

31-05-2024 om 20:22 geschreven door peter  

Unveiling Antarctica’s Alien Secrets: Government Cover-Ups and Hidden Civilizations

The icy expanse of Antarctica has long been a subject of mystery and intrigue. Among the most captivating and controversial theories is the existence of an alien base beneath its frozen surface. This idea has fueled the imagination of UFO enthusiasts and conspiracy theorists alike, with stories that suggest not only the presence of extraterrestrial beings but also secretive government cover-ups. This article delves into these fascinating claims, exploring the potential truths behind the legends and the implications they hold.

Project Stargate: Psychic Spies and Extraterrestrial Encounters

In 1978, the CIA launched a covert operation known as Project Stargate. The project aimed to employ psychic spies to gather intelligence on Soviet activities during the Cold War. Using a technique called remote viewing, these psychics purportedly had the ability to perceive locations and events from afar using only the power of their minds. One notable psychic, Patrick Price, claimed to have seen an alien base inside Mount Hayes in Alaska. He described a facility where extraterrestrials and military personnel worked together using advanced technology. Shortly after revealing his findings to the CIA, Price mysteriously died, leading to speculation about a potential cover-up by the government or even retaliation by the aliens he had described.

Admiral Richard Byrd’s Mysterious Antarctic Expedition

In 1945, Admiral Richard Byrd, a renowned US Naval officer and explorer, led Operation Highjump, the largest expedition to Antarctica. This mission included a massive deployment of 13 ships, 23 aircraft, and over 4,500 military personnel. One of its primary objectives was to locate potential Nazi military bases. However, according to a diary found by Byrd’s son after his death, the expedition uncovered something far more extraordinary.

Byrd’s diary recounts an incredible journey to the Earth’s center through an entrance at the South Pole. Inside, he described a temperate world, lush and green, reminiscent of the Amazon rainforest. The most astonishing discovery was a crystalline city inhabited by advanced beings. These beings, piloting disc-shaped craft, allegedly took control of Byrd’s aircraft and guided them to their city. There, Byrd met a leader referred to as “the Master,” who expressed disappointment with humanity’s use of nuclear weapons during World War II and concern for the planet’s future. Despite this, the aliens caused no harm to Byrd and his team, allowing them to return to the surface unharmed. Upon their return, Byrd was instructed by military officials to keep these findings secret to prevent mass panic.

Implications of Hidden Alien Civilizations

The claims made by Byrd and the implications of Project Stargate present a fascinating, if not unsettling, narrative. If Byrd’s account is to be believed, it suggests the existence of a hidden, technologically advanced civilization beneath Antarctica. This could potentially explain numerous UFO sightings near nuclear sites and military bases, as these beings might be monitoring humanity’s use of such dangerous technology.

The idea of an alien base under Antarctica also raises questions about the broader implications for our understanding of Earth’s history and the potential existence of other hidden civilizations. Could these beings be responsible for ancient myths and legends of gods and advanced beings from below the earth?

VIDEO:

• Antarctica’s Hidden Aliens: What the Government Doesn’t Want You to Know

• https://youtu.be/VLyyK6aHtx0

The theories surrounding an alien base beneath Antarctica are undeniably intriguing, blending elements of historical exploration, government secrecy, and extraterrestrial life. While there is no concrete evidence to confirm these claims, the stories of Project Stargate and Admiral Byrd‘s expedition continue to captivate and inspire those who seek to uncover the unknown. Whether viewed as mere conspiracy theories or potential truths waiting to be discovered, these tales remind us of the vast, uncharted mysteries that our world still holds.

As we continue to explore and understand our planet, the possibility of discovering hidden civilizations, whether alien or ancient human, remains an exciting frontier. Until then, the icy expanse of Antarctica will keep its secrets, waiting for the day they might be revealed.

{ https://www.latest-ufo-sightings.net/ }

31-05-2024 om 19:58 geschreven door peter  

The breakthrough relied on the combination of annual growth ring measurements with the measurable spike in cosmogenic radiocarbon that occurred during the 5259 BC event. This allowed them to establish a chronological reference point for producing accurate dates for the historic settlement, which now may significantly aid archaeological dating at other sites in Southeast Europe.

Additionally, the team behind the new findings says their methods could mark a new standard for dating ancient sites through such processes.

AN EXTREME COSMIC EVENT IN ANCIENT TIMES

In 2022, researchers discovered a pair of extreme solar energetic particle (SEP) events by employing carbon isotope measurements in ancient tree rings dated to 7176 and 5259 BC. Each of the events yielded an increase in 14C of about 2%, a relatively small percentage, albeit one indicating events of far greater magnitude than all similar events previously observed.

Such occurrences happen periodically during eruptive events such as flares and coronal mass ejections, the most recent of which bombarded the planet with cosmogenic radiation beginning on May 10, 2024, producing visible aurorae in parts of the world where such colorful light displays are rarely seen.

Since the observational record is too short to provide an accurate estimation of the frequency of extremely rare SEP events, scientists look for the presence of radionuclides like 10Be, 14C, and 36Cl, all of which can be produced when cosmic rays strike Earth’s atmosphere—to help them reconstruct a clearer picture of past solar activity and highly energetic events like the one that occurred in 5259 BC.

STORIES TOLD IN TREE RINGS

Dendrochronology, the process of using annual growth discernible in tree rings to help date events from the past, is useful for more than just determining things like when extreme solar events have occurred: archaeologists also use it to help them reveal the ages of ancient artifacts and archaeological features that include tombs and settlements.

Above: Cross-section of a California Coast Redwood tree felled in 1934, with rings labeled to indicate several historical events that occurred between 1215 to 1620 AD

(Credit: Larry McElhiney/CC 2.5)

Now, a team from the University of Bern, led by the Institute of Archaeological Sciences, was successfully able to produce dates for the ancient site of Dispilio in northern Greece, using evidence of high-energy particles revealed in timber discovered at the site.

Previous attempts to date the site had proven difficult for a variety of reasons, which include the fact that while tree-ring data extending further back than 12,500 years is readily attainable in many parts of Europe, the same is rarely true for the Mediterranean, according to Andrej Maczkowski, lead author of a study outlining the University of Bern team’s findings.

In fact, there are only a handful of regions around the world where the presence of continuous tree-ring chronologies allows dating accuracy down to the year, such as parts of the American Southwest and northern Alpine foothills and parts of the British Isles. Because of this, dendrochronological dating methods have traditionally been limited.

MIYAKE EVENTS: A PARADIGM SHIFT IN DATING THE PAST

That is, until 2012, when a breakthrough made by Japanese physicist Fusa Miyake revealed that cosmic rays originating from solar flares resulted in spikes in radionuclides, specifically the presence of 14C content found in tree rings.

Now known as Miyake events, dendrochronological data related to these occurrences offer researchers a powerful tool in the form of global anchor points for dating under conditions where annual growth ring chronologies are normally absent. Scientists have now charted Miyake events as far back as 12,350 BC.

“Miyake’s discovery was a paradigm shift,” said Albert Hafner, a University of Bern Professor of Prehistoric Archaeology and senior author of the team’s new study.

Now, Hafner and his colleagues say the area has become “the first region to benefit from this paradigm shift, allowing for absolute dating independent of a consistent calendar.” This is a significant point given that the Balkans are home to many of Europe’s earliest settlements, many of which existed along ancient lakes and other bodies of water around or just after 6000 BC. These thriving ancient communities played a key role in the spread of agriculture throughout the rest of the continent during the ensuing thousands of years.

PRECISION DATING OF AN ANCIENT GREEK SETTLEMENT

In their recent research, the Bern team was able to define a growth ring chronology spanning more than 300 years that ends in 5140 BC, which they achieved by analyzing 787 timber samples collected at Dispilio. With knowledge of the Miyake event that occurred in 5259 BC, the team was able to determine very precise dating that aligned with existing global tree-ring chronologies.

Above: An assemblage of adornments and other artifacts dating to the Neolithic period, recovered during excavations at Dispilio

(Credit: Dispilio Excavation Archive).

Of key significance, the Bern team’s research greatly advances our understanding of prehistoric timelines, offering crucial information for archaeologists and historians about the spread of early farming communities throughout Europe.

“We expect other regional chronologies to rapidly link to the ‘Dispilio Chronology,’” Maczkowski said, “paving the way for a comprehensive dendrochronology for the southern Balkans.”

Maczkowski, Hafner, and the team’s new paper, “Absolute dating of the European Neolithic using the 5259 BC rapid 14C excursion,” was recently published in the journal Nature Communications.

• Micah Hanks is the Editor-in-Chief and Co-Founder of The Debrief. He can be reached by email at micah@thedebrief.org. Follow his work at micahhanks.com and on X: @MicahHanks.

{ https://thedebrief.org/category/space/ }

31-05-2024 om 01:16 geschreven door peter  

New Data Reveals How Galaxies Grew in the Early Universe

These new galaxies in the early universe were still hungrily gobbling up nearby gas.

BY KIONA SMITH

 

University of Copenhagen astrophysicist Kasper Heintz and his colleagues published their work in the journal Science.

THE EPOCH OF REIONIZATION IS GONNA BE LIT

JWST’s instruments helpfully split the light from the distant galaxies into the individual wavelengths that make it up. The spectrum of light coming from an object, like a galaxy, is like a fingerprint of the chemicals that form it, because each chemical compound absorbs, emits, and reflects its own very specific wavelengths of light. Around the three distant galaxies, Heintz and his colleagues noticed that something seemed to be absorbing the same wavelengths of light as cold hydrogen gas – and lots of it.

“These galaxies are like sparkling islands in a sea of otherwise neutral, opaque gas,” says Heintz in a recent statement.

Hydrogen gas, when it’s cold and not electrically-charged (or ionized), absorbs light but doesn’t emit it. This neutral gas filled the early universe, making it impossible for light to travel very far, until a few hundred million years after the Big Bang: a period called the Cosmic Dark Ages.

It took powerful blasts of radiation from the first stars in the first galaxies to strip away electrons from all those hydrogen atoms, creating ionized gas (also called plasma) which is translucent instead of opaque. The Epoch of Reionization had begun – and the three galaxies in Heintz and his colleagues’ recent study are just starting to light it up.

BRAND NEW GALAXIES, SOME ASSEMBLY REQUIRED

Somewhere between 13.2 billion and 13.4 billion years ago — when the light that just reached JWST started its long journey across space — these three early galaxies were still in the process of assembling themselves from the surrounding gas.

“[The data] suggests that we are seeing the assembly of neutral hydrogen into galaxies,” says University of Copenhagen astrophysicist Darach Watson, a coauthor of the recent study, in a statement. And that’s a stage of galaxy formation that astronomers haven’t seen before, especially in the very early universe.

The galaxies, in their infancy, are still surrounded by a cloud of cold, dark, neutral hydrogen gas — the same stuff that caused the Cosmic Dark Ages. Most of that gas will be heated up as it falls into the galaxies, pulled in by their inexorable gravity. And then it will slowly cool, forming lumps like congealed oatmeal, and some of those lumps will be so heavy that they collapse on themselves to form new stars.

Right now (or as we see them right now, which actually happened billions of years ago), what stars these early galaxies contain are mostly young and newly-formed.

“The fact that we are seeing large gas reservoirs also suggests that the galaxies have not had enough time to form most of their stars yet.” But they’ll get there, most likely.

The data reveals not only a previously unseen moment in a galaxy’s life, but also a glimpse of what the early universe was like before the expansion of space pulled everything farther apart, turning most galaxies into lonely beacons, or at most isolated clusters of lights, in the void.

“We’re moving away from a picture of galaxies as isolated ecosystems,” says University of Copenhagen astrophysicist Simone Nielsen in a recent statement. “At this stage in the history of the universe, galaxies are all intimately connected to the intergalactic medium with its filaments and structures of pristine gas.”

In the very early universe, no galaxy was an island (yet).

 { https://www.inverse.com/ }

31-05-2024 om 00:20 geschreven door peter  

By Shanna Hogan

Sarah2/Shutterstock

As related in a 1950 book called "Behind the Flying Saucers," the tale features two men who pulled a couple of dead alien corpses from the wreckage and stored them in a freezer until the army picked them up. Another version has the spacecraft crashing miles away, in Cave Creek or Paradise Valley.

"What’s amazing and significant is that there were two UFO crashes, one in Roswell and one in Phoenix, within fairly close proximity, that occurred in the same year," Willes says. "As far as the dam being built over the crash site, that’s a possibility, but I don’t see why the government wouldn't just remove the wreckage and there wouldn't be anything left but desert landscape."

A 1945 U.S. government Phoenix Sectional Chart showing Marana Army Air Field and Marana Auxiliary Army Airfield No. 2, No. 4, No. 5

Chris Kennedy/Public domain

A screengrab of camcorder footage of the V-shaped formation of lights that appeared over the Valley on March 13, 1997.

Screen Grab

5. The Phoenix Lights (1997)

As most Arizonans know, the otherworldly event that elevated Phoenix's prominence in the annals of UFO lore was the Phoenix Lights — one of the largest mass UFO sightings of all time.

On March 13, 1997, a string of glowing orbs hovered over Paradise Valley skies. For three hours the huge, V-shaped formation passed silently over a 300-mile corridor from the Nevada line through Phoenix to the northern edge of Tucson.

The lights were witnessed by thousands and photographed by hundreds, who had been watching the skies that night to catch a glimpse of a passing comet.

"Much has happened since the historic and still-unexplained March 13, 1997, mass sighting, propelling the Phoenix Lights into the international limelight as the most witnessed, most documented, and most important mass anomalous aerial events in modern history,” she tells New Times. 

Jeff Willes says the Phoenix Lights was impossible for the government to conceal. 

"The Phoenix Lights is Arizona's biggest UFO story," he says. "Thousands of witnesses saw this V-shaped object that flew all across the state. There still hasn’t been a UFO sighting like that in UFO history."

    - (This article originally appeared in 2016 and has been updated.)

30-05-2024 om 22:13 geschreven door peter  

UFO Sighting Caught On Video In New York During Blue Angels Show Has People Stumped

BY DOUGLAS CHARLES

It is not unusual for pilots to report seeing UFOs. In fact, they probably see more UFOs than the average person because, well, they are thousands of feet up in the sky.

What is more unusual is for people on the ground watching pilots fly their aircraft to spot a UFO in the same sky at the very same time.

Then again, how often does the average person spend looking at the sky in a given day. Surely, it is much less than they do when they are at an air show. So someone spotting a UFO at an event like that makes some sense.

It happened in 2023 when a UFO appeared to join the Royal Air Force (RAF) Red Arrows and was caught on camera.

It also happened in 2022 during Queen Elizabeth II’s Platinum Jubilee parade while nine fighter jets flew in formation over the festivities.

And now it has happened again in 2024.

While the Navy’s Blue Angels were performing a demonstration during an air show on Long Island over Memorial Day weekend, a UFO appeared to zoom past a Boeing F/A-18 Super Hornet while it was flying over Jones Beach.

Of course, it was caught on video, but just for a split second. Even slowing down the video shows how incredibly quick this UFO was when compared to the speed of the fighter jet.

According to a report filed with the National UFO Reporting Center (NUFORC), here’s what the witness saw.

“Weekend of Bethpage Airshow – was looking for anything in the sky,” they wrote. “From stated location above, looking very high in the sky – approximately 36,500 to 41,000 ft high. Looking Westward from my location, tracking it going North by Northwest, by eye.

“Held at arms length, UAP was about the size of a slightly less than a pea, but greater than a grain of rice. Going very fast for a craft that high. No trails seen. Vividly tracked it visually for about 9 seconds. Then, saw it take an immediate and distinct 90 degree turn downward to about 18,000 feet within two to maybe 3 seconds. Distinctly able to follow it visually to that level when it simply disappeared.

{ https://brobible.com/ }

30-05-2024 om 21:44 geschreven door peter