The purpose of this blog is the creation of an open, international, independent and free forum, where every UFO-researcher can publish the results of his/her research. The languagues, used for this blog, are Dutch, English and French.You can find the articles of a collegue by selecting his category. Each author stays resposable for the continue of his articles. As blogmaster I have the right to refuse an addition or an article, when it attacks other collegues or UFO-groupes.
Druk op onderstaande knop om te reageren in mijn forum
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Deze blog is opgedragen aan mijn overleden echtgenote Lucienne.
In 2012 verloor ze haar moedige strijd tegen kanker!
In 2011 startte ik deze blog, omdat ik niet mocht stoppen met mijn UFO-onderzoek.
BEDANKT!!!
Een interessant adres?
UFO'S of UAP'S, ASTRONOMIE, RUIMTEVAART, ARCHEOLOGIE, OUDHEIDKUNDE, SF-SNUFJES EN ANDERE ESOTERISCHE WETENSCHAPPEN - DE ALLERLAATSTE NIEUWTJES
UFO's of UAP'S in België en de rest van de wereld Ontdek de Fascinerende Wereld van UFO's en UAP's: Jouw Bron voor Onthullende Informatie!
Ben jij ook gefascineerd door het onbekende? Wil je meer weten over UFO's en UAP's, niet alleen in België, maar over de hele wereld? Dan ben je op de juiste plek!
België: Het Kloppend Hart van UFO-onderzoek
In België is BUFON (Belgisch UFO-Netwerk) dé autoriteit op het gebied van UFO-onderzoek. Voor betrouwbare en objectieve informatie over deze intrigerende fenomenen, bezoek je zeker onze Facebook-pagina en deze blog. Maar dat is nog niet alles! Ontdek ook het Belgisch UFO-meldpunt en Caelestia, twee organisaties die diepgaand onderzoek verrichten, al zijn ze soms kritisch of sceptisch.
Nederland: Een Schat aan Informatie
Voor onze Nederlandse buren is er de schitterende website www.ufowijzer.nl, beheerd door Paul Harmans. Deze site biedt een schat aan informatie en artikelen die je niet wilt missen!
Internationaal: MUFON - De Wereldwijde Autoriteit
Neem ook een kijkje bij MUFON (Mutual UFO Network Inc.), een gerenommeerde Amerikaanse UFO-vereniging met afdelingen in de VS en wereldwijd. MUFON is toegewijd aan de wetenschappelijke en analytische studie van het UFO-fenomeen, en hun maandelijkse tijdschrift, The MUFON UFO-Journal, is een must-read voor elke UFO-enthousiasteling. Bezoek hun website op www.mufon.com voor meer informatie.
Samenwerking en Toekomstvisie
Sinds 1 februari 2020 is Pieter niet alleen ex-president van BUFON, maar ook de voormalige nationale directeur van MUFON in Vlaanderen en Nederland. Dit creëert een sterke samenwerking met de Franse MUFON Reseau MUFON/EUROP, wat ons in staat stelt om nog meer waardevolle inzichten te delen.
Let op: Nepprofielen en Nieuwe Groeperingen
Pas op voor een nieuwe groepering die zich ook BUFON noemt, maar geen enkele connectie heeft met onze gevestigde organisatie. Hoewel zij de naam geregistreerd hebben, kunnen ze het rijke verleden en de expertise van onze groep niet evenaren. We wensen hen veel succes, maar we blijven de autoriteit in UFO-onderzoek!
Blijf Op De Hoogte!
Wil jij de laatste nieuwtjes over UFO's, ruimtevaart, archeologie, en meer? Volg ons dan en duik samen met ons in de fascinerende wereld van het onbekende! Sluit je aan bij de gemeenschap van nieuwsgierige geesten die net als jij verlangen naar antwoorden en avonturen in de sterren!
Heb je vragen of wil je meer weten? Aarzel dan niet om contact met ons op te nemen! Samen ontrafelen we het mysterie van de lucht en daarbuiten.
23-01-2026
NASA reveals list of most scientifically accurate sci-fi movies ever made
NASA reveals list of most scientifically accurate sci-fi movies ever made
NASA has shared a surprising list of movies it considers among the most scientifically accurate ever made.
The films span nearly a century of cinema, from silent-era classics to modern blockbusters and were praised for respecting real scientific principles rather than relying on fantasy.
According to NASA and NASA-affiliated scientists, accuracy is not about predicting the future perfectly, but about portraying science, scientists and technology realistically.
Movies like Gattaca and Jurassic Park earned recognition for their grounded treatment of genetics, DNA and complex systems.
Others, including Contact and The Day the Earth Stood Still, made the list for their realistic depictions of space exploration, radio astronomy and extraterrestrial contact.
Even early science-fiction films, such as Metropolis, released in 1927, and the 1929 Woman in the Moon, were praised for their societal and ethical consequences of advanced technology and rocket science.
NASA has noted that these movies take science seriously, showing careful experimentation, skepticism, and problem-solving rather than magical solutions.
Together, the list highlights how some of Hollywood's most enduring science-fiction stories were built on ideas that remain scientifically sound decades later.
Gattaca (1997)
Set in a future where people are judged by their DNA, Gattaca follows a man born without genetic enhancements who dreams of traveling to space
Set in a future where people are judged by their DNA, the story is about a society that is divided by genetics, with 'Valids' (genetically engineered) holding privilege and 'In-Valids' (naturally born) relegated to menial jobs
Vincent Freeman (played by Ethan Hawke), an In-Valid, assumes a Valid's identity to achieve his dream of space travel, confronting discrimination and uncovering a murder mystery along the way, exploring themes of destiny versus determination and the human spirit's power over biology.
NASA praises Gattaca for its realistic portrayal of genetics and DNA-based discrimination.
While the technology is speculative, the film accurately reflects how genetic testing works and raises plausible ethical concerns about gene selection, privacy, and human enhancement, issues scientists still debate today.
Contact (1997)
Jodie Foster plays the astronomer who detects the alien signal in Contact
A radio astronomer, played by Jodie Foster, discovers a signal from an intelligent alien civilization.
As scientists work to decode it, the film explores humanity's first contact with extraterrestrial life, balancing hard science with questions of faith, politics and belief.
Contact is often cited as one of the most scientifically accurate space films ever made, as it was based on a novel by astronomer Carl Sagan.
NASA has highlighted its realistic depiction of radio astronomy and SETI research, scientific skepticism and peer review, the politics and funding challenges behind major space projects and the way scientists search for extraterrestrial signals as being shown with exceptional realism.
Metropolis (1927)
In a futuristic city divided between wealthy elites and exploited workers, a powerful industrialist creates a human-like robot to maintain control. Metropolis examines automation, artificial intelligence, and the dangers of unchecked technological power
This German expressionist sci-fi silent film is set in a futuristic city divided between opulent elites and a downtrodden working class.
The film follows Freder, the privileged son of a powerful industrialist, who falls in love with Maria, a worker who speaks out for the oppressed laborers running the city's machines.
His awakening exposes deep class divisions and leads to chaos sparked by a robotic double of Maria, ending with a call for compassion to bridge the gap between those who control society and those who keep it running.
Despite its age, Metropolis is praised for its forward-thinking view of technology, automation, and artificial intelligence. NASA has noted how the film accurately anticipated ethical concerns surrounding machines replacing human labor and the social consequences of advanced technology.
The Day the Earth Stood Still (1951)
This film is a classic science fiction film about an alien visitor, Klaatu, who lands in Washington DC, accompanied by a powerful robot named Gort.
In The Day the Earth Stood Still an alien visitor arrives on Earth with a warning for humanity about violence and nuclear weapons. Rather than focusing on invasion, the story centers on diplomacy, global responsibility, and the consequences of technological aggression
He delivers a stark ultimatum to humanity: abandon violence and nuclear weapons or face destruction by an interstellar force, echoing Cold War fears about war, peace, and survival.
NASA has pointed to this film’s serious treatment of extraterrestrial contact, portraying aliens as advanced but logical beings rather than monsters. The movie emphasizes science, diplomacy, and global consequences rather than fantasy-driven invasions.
Woman in the Moon (1929)
This early science-fiction film follows a privately funded expedition to the moon in search of gold. Woman on the moon realistically portrays rocket launches, space travel, and weightlessness decades before real lunar missions occurred
Woman in the Moon (Frau im Mond) is a German silent sci-fi film about a mission to the moon driven by greed for its gold.
The film features a love triangle and pioneering depictions of space travel, like countdowns and zero gravity, ultimately exploring themes of ambition, materialism and love amidst a backdrop of espionage and adventure.
The Thing from Another World (1951)
In The Thing from Another World, scientists and military personnel in the Arctic discover a frozen alien life form. As the creature is thawed, the group must rely on scientific reasoning and experimentation to understand and stop the threat
This is a classic black-and-white science fiction horror film about scientists and Air Force personnel at a remote Arctic outpost battling a bloodthirsty, plant-like alien discovered frozen in ice.
As the creature is thawed, the group must rely on scientific reasoning and experimentation to understand and stop the threat.
Jurassic Park (1993)
Jurassic Park is about a billionaire who uses advanced genetic technology to clone dinosaurs from ancient DNA and opens a theme park filled with living prehistoric creatures. When the system fails, the film explores chaos theory, human error and the limits of scientific control
This groundbreaking Steven Spielberg-directed sci-fi adventure film is about a billionaire's theme park of cloned dinosaurs on a remote island, which goes disastrously wrong when a security failure allows the prehistoric creatures to escape and hunt the visitors.
While cloning dinosaurs is fictional, NASA scientists have praised Jurassic Park for its accurate explanation of DNA, genetics, and chaos theory.
The film correctly shows how small variables can lead to catastrophic outcomes in complex systems, a real scientific principle.
RELATED VIDEOS ( all videos selected and attached by peter2011 )
NASA has revealed a terrifying glimpse into our solar system's grizzly fate.
In five billion years, scientists believe the sun will collapse, leaving behind a shell of gas and dust.
When this happens, Earth will be consumed by the expanding sun or torn apart by powerful gravitational forces, before fresh planets are spat back out.
Now, in stunning new images, the James Webb Space Telescope (JWST) shows exactly what this might look like.
Located 650 light–years from Earth, the Helix Nebula is a shell of dust and gas left behind by a sun–like star that ran out of fuel thousands of years ago.
Astronomers have revealed incredible structures inside the three–light–year–wide ring of gas shed by this dying star.
According to the space agency, these images offer an 'up–close view of the possible eventual fate of our own Sun and planetary system.'
The situation is not entirely bleak, as these strange structures could contain the raw materials for new worlds capable of supporting complex life.
NASA has revealed the most detailed images yet of the Helix Nebula, the remains of a dying star 650 light–years from Earth (pictured)
Throughout most of a star's life, the crushing weight of gravity is balanced by the force of nuclear fusion as hydrogen is converted into helium inside the stellar core.
Stars like our sun can remain in this stable 'main sequence' phase for billions of years as they work through massive reserves of atomic hydrogen.
But as the hydrogen starts to run out, the star can't sustain these fusion reactions and the outer layers begin to collapse inwards.
The pressure from this collapse creates such intense heat that it can fuse helium atoms into carbon, releasing a surge of energy that kickstarts nuclear fusion in the outer layers.
That reaction causes the star's outer layers to balloon outwards, becoming 100 to 1,000 times larger and cooling into an enormous Red Giant.
The intense radiation from the White Dwarf at the nebula's heart lights up the expanding shell of gas, allowing us to see the details of the stellar transformation.
In the JWST image, although the White Dwarf is out of frame, NASA reveals how the star's radiation continues to sculpt remarkable structures in its surroundings.
NASA says that these images of the distant Helix Nebula offer a vision of what might happen to our sun and planetary system when the sun dies in around five billion years
Scientists say that the material jettisoned into space by the nebula will eventually go on to form new planets in other solar systems
A star's life cycle
Around 90 per cent of stars in the sun are what scientists call 'main sequence' stars.
These are stars that fuse hydrogen into helium in their cores, and range from about a tenth of the mass of the sun to about 200 times as massive.
Main sequence stars start as clouds of gas and dust, which collapse under gravity into 'protostars'.
When a protostar is dense enough, the pressure and heat start nuclear fusion and a star is born.
Stars keep burning helium until it runs out in around 10 to 20 billion years.
At this point, stars will enter the post–main sequence phase and become red dwarfs, white dwarfs, red giants, or even explode into neutron stars, depending on their size.
While previous images from the Hubble Space Telescope only rendered this region as a hazy blur, the NIRCam shows the stark transition between hot and cool gas.
In the picture, the touches of blue light mark the hottest regions, where gases are energised by the ultraviolet light from the White Dwarf.
Farther out, yellow regions show cooler areas where hydrogen atoms can form into molecules, while red indicates the coolest areas where the gas thins and dust starts to form.
Overall, 0.28 per cent of stars surveyed were home to a giant planet, with the youngest stars in the sequence having planets more frequently.
But for stars that had already grown enough to be classed as red giants, just 0.11 per cent were home to planets.
In about five billion years, scientists say that the sun will burn the last of its hydrogen fuel. When this happens, it will expand to about 200 times its current size to become a red giant and destroy Earth (artist's impression)
Although the sun would be destroyed, the material released into space could go on to make new planets capable of supporting carbon–based life. Pictured: The outer edge of the Helix Nebula as seen by Hubble
However, Professor Janet Drew, an astronomer from University College London who was not involved in the study, says that this process is really about 'creation, rather than destruction'.
The JWST images show the cloud of hydrogen and dust that was formed in the 'envelope' of the extreme red giant before it was sloughed off to form the nebula.
Inside the nebula, Professor Drew says that this chemically enriched material is 'fed into the interstellar medium, where that material can become available for the next generation of stars and planets.'
'So this is really about where the material comes from that is needed to form a rocky planet and sustain carbon–based life,' says Professor Drew.
So, when our planet is destroyed by the sun in five billion years' time, it might provide the raw materials needed to give rise to another generation of life.
Five billion years from now, it's said the Sun will have grown into a red giant star, more than a hundred times larger than its current size.
Eventually, it will eject gas and dust to create an 'envelope' accounting for as much as half its mass.
The core will become a tiny white dwarf star. This will shine for thousands of years, illuminating the envelope to create a ring-shaped planetary nebula.
Five billion years from now, it's said the Sun will have grown into a red giant star, more than a hundred times larger than its current size
While this metamorphosis will change the solar system, scientists are unsure what will happen to the third rock from the Sun.
We already know that our Sun will be bigger and brighter, so that it will probably destroy any form of life on our planet.
But whether the Earth's rocky core will survive is uncertain.
AI model that found 370 exoplanets now digs into TESS data
AI model that found 370 exoplanets now digs into TESS data
Story by Lauren Leese
Artist's impression of NASA’s Transiting Exoplanet Survey Satellite (TESS), which launched in 2018 and has discovered nearly 700 exoplanets so far. NASA’s ExoMiner++ software is working toward identifying more planets in TESS data using artificial intelligence.
Credit: NASA's Goddard Space Flight Center
Scientists have discovered over 6,000 planets that orbit stars other than our sun, known as exoplanets. More than half of these planets were discovered thanks to data from NASA's retired Kepler mission and NASA's current TESS (Transiting Exoplanet Survey Satellite) mission. However, the enormous treasure trove of data from these missions still contains many yet-to-be-discovered planets. All of the data from both missions is publicly available in NASA archives, and many teams around the world have used that data to find new planets using a number of techniques.
This artist's impression shows the star TRAPPIST-1 with two planets transiting across it. ExoMiner++, a recently updated open-source software package developed by NASA, uses artificial intelligence to help find new transiting exoplanets in data collected by NASA’s missions.
Credit: NASA, ESA, and G. Bacon (STScI)
In 2021, a team from NASA's Ames Research Center in California's Silicon Valley created ExoMiner, a piece of open-source software that used artificial intelligence (AI) to validate 370 new exoplanets from Kepler data. Now, the team has created a new version of the model trained on both Kepler and TESS data, called ExoMiner++.
The new algorithm, which is discussed in a recent paper published in The Astronomical Journal, identified 7,000 targets as exoplanet candidates from TESS on an initial run. An exoplanet candidate is a signal that is likely to be a planet but requires follow-up observations from additional telescopes to confirm.
ExoMiner++ can be freely downloaded from GitHub, allowing any researcher to use the tool to hunt for planets in TESS's growing public data archive.
"Open-source software like ExoMiner accelerates scientific discovery," said Kevin Murphy, NASA's chief science data officer at NASA Headquarters in Washington. "When researchers freely share the tools they've developed, it lets others replicate the results and dig deeper into the data, which is why open data and code are important pillars of gold-standard science."
ExoMiner++ sifts through observations of possible transits to predict which ones are caused by exoplanets and which ones are caused by other astronomical events, such as eclipsing binary stars. "When you have hundreds of thousands of signals, like in this case, it's the ideal place to deploy these deep learning technologies," said Miguel Martinho, a KBR employee at NASA Ames who serves as the co-investigator for ExoMiner++.
7 Earth-Like Planets Found by NASA — This Changes Everything
Kepler and TESS operate differently—TESS is surveying nearly the whole sky, mainly looking for planets transiting nearby stars, while Kepler looked at a small patch of sky more deeply than TESS. Despite these different observing strategies, the two missions produce compatible datasets, allowing ExoMiner++ to train on data from both telescopes and deliver strong results.
"With not many resources, we can make a lot of returns," said Hamed Valizadegan, the project lead for ExoMiner and a KBR employee at NASA Ames.
The next version of ExoMiner++ will improve the usefulness of the model and inform future exoplanet detection efforts. While ExoMiner++ can currently flag planet candidates when given a list of possible transit signals, the team is also working on giving the model the ability to identify the signals themselves from the raw data.
In addition to the ongoing stream of data from TESS, future exoplanet-hunting missions will give ExoMiner users plenty more data to work with. NASA's upcoming Nancy Grace Roman Space Telescope will capture tens of thousands of exoplanet transits—and, like TESS data, Roman data will be freely available in line with NASA's commitment to Gold Standard Science and sharing data with the public. The advances made with the ExoMiner models could help hunt for exoplanets in Roman data, too.
"The open science initiative out of NASA is going to lead to not just better science, but also better software," said Jon Jenkins, an exoplanet scientist at NASA Ames. "Open-source science and open-source software are why the exoplanet field is advancing as quickly as it is."
More information:
Hamed Valizadegan et al, ExoMiner++: Enhanced Transit Classification and a New Vetting Catalog for 2-minute TESS Data, The Astronomical Journal (2025). DOI: 10.3847/1538-3881/ae03a4
The Book of Enoch Explained: Why It Was Removed From the Bible The Book of Enoch is one of the most mysterious and debated texts associated with early Jewish and Christian traditions. Often referenced but rarely included in mainstream scripture, it offers visions of angels, fallen watchers, and cosmic judgment that are both fascinating and unsettling. Its vivid imagery and unconventional theology have made scholars and mystics alike question its place in the biblical canon. Here, we explore seven key ways to understand the Book of Enoch and examine why it was ultimately removed from the Bible, shedding light on its historical, spiritual, and symbolic significance.
1. Enoch as a Bridge Between Humans and Angels One of the most distinctive features of the Book of Enoch is its portrayal of Enoch himself as a mediator between humanity and celestial beings.
Unlike most figures in the Hebrew Bible, Enoch is taken directly into the heavens, guided by angels, and given knowledge of cosmic secrets.
The book describes “watchers,” angels who descended to Earth, interacted with humans, and shared forbidden knowledge.
This interaction between the divine and human worlds challenges traditional biblical boundaries, offering a vision of spirituality that is both expansive and controversial.
By presenting a human figure who directly experiences divine wisdom, the text blurs the line between mortal and celestial realms, a theme that may have made religious authorities wary of including it in scripture.
2. Detailed Accounts of Fallen Angels The Book of Enoch is perhaps best known for its detailed account of the fallen angels, also called watchers, who rebelled against God.
These beings descended to Earth, taught humanity forbidden knowledge, and took human wives, producing a race of giants.
Such stories offer a vivid explanation for the presence of evil and corruption in the world, but they also challenge conventional theology.
The notion that angels could sin, reproduce, and dramatically influence human history was radical, and it conflicted with emerging orthodox views that emphasised strict separation between divine and mortal spheres.
The dramatic narratives of rebellion and judgment in Enoch may have been considered too speculative or sensational for inclusion in the canonical Bible.
3. Cosmic Visions of Heaven and Hell The Book of Enoch contains extensive descriptions of heaven, hell, and the structure of the cosmos.
Enoch is shown the places where angels dwell, the paths of celestial bodies, and the punishment awaiting sinful spirits.
These visionary accounts are much more detailed than most biblical texts, blending prophetic insight with apocalyptic imagery.
While this richness makes the book a treasure for mystics and esoteric traditions, it may have seemed incompatible with the theological frameworks being established during the formation of the Bible.
Church authorities might have viewed such elaborate cosmology as speculative, difficult to verify, or potentially misleading to believers.
4. Emphasis on Judgment and the End Times The Book of Enoch heavily emphasises divine judgment, the punishment of the wicked, and the eventual restoration of righteousness.
These apocalyptic themes were influential in shaping later Christian eschatology but were presented in ways that were strikingly different from canonical texts.
Enoch describes the final fate of the fallen angels, the coming flood, and the resurrection of the righteous, often with intense symbolism and graphic detail.
This intense focus on judgment, while spiritually compelling, may have been seen as too extreme or too divergent from mainstream theological narratives.
Its unique apocalyptic vision positioned it outside the bounds of accepted scripture, even as it influenced later biblical writings indirectly.
5. Unique Interpretations of Sin and Knowledge In Enoch, sin is often linked to the transmission of forbidden knowledge rather than simple disobedience.
The watchers teach humans metalworking, astrology, and other arts that, while useful, corrupt the natural order and lead to moral decay.
This portrayal contrasts with the canonical Bible, where sin is more often a matter of disobedience, rebellion, or idolatry.
By presenting knowledge itself as potentially corrupting, the Book of Enoch raises challenging theological questions.
It implies that curiosity, learning, or divine insight can be dangerous, which may have conflicted with the emerging focus on moral instruction and obedience in the canonical texts.
6. Influence on Early Christianity and Controversy Despite its exclusion from the Bible, the Book of Enoch influenced early Christian thought. The Epistle of Jude in the New Testament directly references Enoch, and early church fathers were aware of its existence.
However, its inclusion sparked debate. Some early Christian leaders admired its moral teachings and apocalyptic vision, while others criticised its speculative nature and angelic focus.
The text’s ambiguity and complexity made it difficult to regulate, and its sensational stories risked misinterpretation.
As the canon solidified, church authorities likely chose to exclude it to maintain theological consistency and control over accepted doctrine.
7. Preservation and Continued Mystical Appeal Though removed from the canonical Bible, the Book of Enoch survived through careful preservation in Jewish and Ethiopian traditions.
It was translated into multiple languages and studied by mystics, scholars, and occultists for centuries.
Its enduring appeal lies in its imaginative cosmology, moral lessons, and vivid portrayal of angels, demons, and human destiny.
By exploring forbidden knowledge, divine justice, and the structure of the universe, the text continues to inspire curiosity and spiritual reflection.
The reasons for its exclusion only add to its mysterious and mystical aura, making it a unique window into ancient spiritual imagination.
De bewaker van het buitenste zonnestelsel Als zesde planeet vanaf de zon en het meest in het oog springende hemellichaam van het zonnestelsel, overstijgt Saturnus zijn eenvoudige omschrijving. Zijn ringen, bestaande uit stukken ijs en gesteente die in perfecte banen zweven, hebben generaties astronomen gefascineerd, van Galileo tot moderne ruimtesondes, en onthullen een wereld vol gigantische stormen, bijzondere manen en raadselachtige zwaartekrachtverschijnselen.
Een gasreus van immense omvang Met een doorsnee van ongeveer 120.500 kilometer is Saturnus negen keer breder dan de aarde. National Geographic benadrukt dat het een ‘gasreus’ is, die voornamelijk uit waterstof en helium bestaat. Zijn massa is 95 keer zo groot als die van de aarde, maar door de lage gemiddelde dichtheid zou hij in theorie kunnen drijven in een enorme oceaan.
De planeet met de beroemde ringen De ringen van Saturnus zijn niet massief. Volgens NASA bestaan ze uit ‘miljarden stukjes ijs, steen en stof’. Ze reiken tot 280.000 kilometer vanaf de planeet, maar hun gemiddelde dikte bedraagt slechts enkele honderden meters. Deze kwetsbaarheid maakt ze tot een schitterende, maar vergankelijke structuur.
Het raadsel van het ontstaan Jarenlang hebben wetenschappers gediscussieerd over het ontstaan van de ringen. National Geographic meldt dat het mogelijk overblijfselen zijn van manen die door de zwaartekracht van Saturnus zijn vernietigd. Gegevens van Cassini wijzen erop dat de ringen tussen 100 en 400 miljoen jaar oud zijn, relatief jong op astronomische schaal.
Een korte dag en een lang jaar Op Saturnus duurt een dag slechts 10,7 uur. Zijn baan om de zon is echter traag: een Saturnusjaar duurt ongeveer 29,5 aardse jaren. Deze combinatie zorgt voor krachtige winden en hardnekkige atmosferische patronen die decennia standhouden.
Extreme winden en heftig weer De atmosfeer van Saturnus kent winden tot wel 1800 km/u, aldus NASA. Gele, gouden en bruine wolkenbanden trekken over de planeet. National Geographic wijst op enorme stormen die de hele planeet kunnen omspannen en zelfs vanaf de aarde zichtbaar zijn met telescopen.
De beroemde zeshoek op de noordpool Een van de opvallendste verschijnselen is de zeshoekige structuur op de noordpool. Ontdekt door Voyager en verder onderzocht door Cassini, heeft dit stabiele geometrische patroon een breedte van zo’n 30.000 kilometer. NASA beschrijft het als een ‘zeszijdige straalstroom’, uniek in het zonnestelsel.
Een planeet zonder vaste bodem In tegenstelling tot de aarde heeft Saturnus geen vast oppervlak om op te landen. National Geographic geeft aan dat de druk en temperatuur toenemen naarmate men afdaalt in zijn atmosfeer, tot de gassen veranderen in dichte vloeistoffen. Elke sonde zou worden verpletterd lang voordat een denkbare kern wordt bereikt.
Het verborgen binnenste Wetenschappers vermoeden dat Saturnus een vaste kern heeft van gesteente en ijs. NASA schat dat deze een massa heeft van 10 tot 20 keer die van de aarde. Rondom deze kern bevindt zich metallic waterstof, die verantwoordelijk is voor het sterke magnetische veld.
Een opmerkelijk magneetveld Het magneetveld van Saturnus is minder krachtig dan dat van Jupiter, maar bijzonder symmetrisch. Volgens NASA is het bijna perfect uitgelijnd met de rotatieas van de planeet. Deze bijzonderheid vormt een uitdaging voor klassieke modellen van het ontstaan van magnetische velden bij planeten.
Meer dan 140 bekende manen Saturnus vormt een waar miniplanetenstelsel. Tot 2023 waren er meer dan 140 manen bevestigd. National Geographic merkt op dat sommige manen nauwelijks meer zijn dan grillige rotsblokken, terwijl andere, zoals Titan, qua complexiteit met planeten kunnen wedijveren.
Titan, een maan met een atmosfeer Titan is het pronkstuk onder de manen van Saturnus. Het is de op een na grootste maan in het zonnestelsel en de enige met een dikke atmosfeer. NASA verklaart dat ‘Titan een van de meest aardachtige werelden is’, hoewel de chemie wordt gedomineerd door koolwaterstoffen.
Meren van methaan en ethaan Op Titan komen zeeën en meren voor, maar deze bestaan niet uit water. National Geographic beschrijft dat ze gevormd worden door vloeibaar methaan en ethaan. Deze vloeistoffen maken deel uit van een klimaatsysteem dat vergelijkbaar is met de waterkringloop op aarde, maar werkt bij temperaturen rond de −180 °C.
Enceladus en zijn geisers Een andere belangrijke maan is Enceladus. Cassini ontdekte geisers van zout water die de ruimte in worden gespoten. NASA meldt dat deze uitbarstingen essentiële bouwstenen voor leven bevatten. Onder het ijs zou zich een wereldwijde oceaan kunnen bevinden.
Een natuurlijk laboratorium voor de wetenschap Saturnus biedt mogelijkheden om fundamentele processen te onderzoeken: planeetvorming, atmosferische dynamiek en de evolutie van ringen. National Geographic geeft aan dat waarnemingen van deze planeet inzicht bieden in het verleden van het zonnestelsel, toen de reuzenplaneten het jonge systeem domineerden.
De Cassini-Huygens missie Tussen 2004 en 2017 veranderde Cassini ons beeld van Saturnus volledig. NASA omschrijft deze missie als een ‘spectaculair succes’. Meer dan 450.000 beelden en waardevolle data over de ringen, manen en atmosfeer werden verzameld.
Het geplande einde van een ruimtesonde Cassini beëindigde zijn missie door zichzelf in Saturnus te storten, om te voorkomen dat mogelijk bewoonbare manen besmet zouden raken. Volgens NASA was dit de ‘grand finale’. Tijdens deze afdaling werden nooit eerder verkregen gegevens over de bovenste atmosfeer verzameld.
Een planeet zichtbaar vanaf aarde Saturnus is met het blote oog te zien vanaf onze planeet. Zijn heldere gloed en geelachtige kleur maakten hem al in de oudheid herkenbaar. National Geographic geeft aan dat oude beschavingen hem al kenden als een dwalende ster, lang voordat de pracht van zijn ringen werd ontdekt.
Een reus die nog steeds raadsels biedt Ondanks decennia van onderzoek zijn er nog steeds onbeantwoorde vragen over Saturnus. Hoe lang blijven zijn ringen bestaan? Wat gebeurt er precies in het binnenste? National Geographic benadrukt dat elke ontdekking weer nieuwe raadsels oproept, waardoor deze ringplaneet ons blijft fascineren.
The new approach could assist efforts to alert people on the ground about falling space debris that could pose a danger to property and individuals.
Dangers Rising from an Increasing Population of Falling Objects entering Earth’s Atmosphere
Since the Soviet Union launched humanity’s first spacecraft in 1957, thousands of satellites and other objects have been rocketed into Low Earth Orbit (LEO). As the population of space-based objects has grown, incidents of falling debris causing damage on the ground have increased. These incidents are only expected to increase as LEO continues to fill up.
While the kinetic effects of falling debris can be catastrophic, the Los Alamos researchers note that uncontrolled re-entry of spacecraft can pose additional threats. For example, a spacecraft carrying radioactive materials could pose a larger danger than a single crashed satellite. Many of these crafts also contain toxic and flammable materials, further increasing the potential hazards posed by their re-entry.
Unfortunately, predicting when and where such events will occur is extremely difficult. The problem is compounded by limitations in ground-based radar and optical tracking systems designed to monitor LEO for potential threats, since these objects begin to disintegrate as they enter the atmosphere.
These limitations motivated Los Alamos scientists Benjamin Fernando and Constantinos Charalambous to look for alternative methods to track disintegrating objects and predict when and where they might strike land.
Tracking the Reentry of Shenzhou-15 Reentry Confirms New Approach
According to a statement detailing the team’s novel debris-tracking approach, they began by examining publicly available data from ground-based seismic sensors to search for signs of shockwaves, or sonic booms, caused by reentering debris. As a test case, they focused their search on the April 2024 reentry of China’s large and heavy Shenzhou-15 orbital module.
Before its reentry, the abandoned module had been in a decaying orbit that regularly passed over many population centers around the globe. The falling object’s sheer size and toxic material components stoked fears that its eventual reentry could be catastrophic.
An artist’s impression of the re-entering debris breaking up over California and generating a sonic boom, which propagates down to the ground and is recorded by seismometers.
Image Credit: Sophia Economon and Benjamin Fernando
After scanning seismic sensor data from sensors placed throughout Southern California and Nevada, the team spotted the telltale sonic booms of Shenzou-15’s atmospheric reentry. Using mathematical models, the team successfully interpolated the arrival times of the largest shockwaves from the module’s reentry at different locations across the southern US.
The team said that this data allowed them to estimate Shenzhou-15’s altitude, speed, and ground track with surprising accuracy. Specifically, the observed reentry location and the Tracking and Impact Prediction estimate, which placed the landing spot somewhere in the Atlantic Ocean, were 8,600 kilometers apart.
Shenzhou 15 Orbital Module reentry seen from Big Bend National Park (bottom right). Note also Milky Way (center) and Zodiacal Light (right).
The data also revealed that the module did not fall in a single event but instead fragmented over time into progressively smaller pieces. Notably, the team said that the spacecraft’s breakup matched eyewitness reports.
Unlocking the Rapid Identification of Debris Fall-Out Zones
When discussing potential applications of their novel seismic reentry-tracking approach, the Los Alamos team said this technology could be used to track debris on the ground after impact, aiding search-and-recovery efforts. The approach could also help scientists track the spread of smaller hazardous particles in Earth’s atmosphere, which they call “crucial for recovery and contamination mitigation.”
Scientist Chris Carr noted that further research will be needed to shorten the time needed to calculate an object’s trajectory once its sonic booms and shockwaves have been detected. However, Carr also praised the Los Alamos team’s method, stating that Fernando and Charalambous’ approach “unlocks the rapid identification of debris fall-out zones, which is key information as Earth’s orbit is anticipated to become increasingly crowded with satellites, leading to a greater influx of space debris.”
Christopher Plain is a Science Fiction and Fantasy novelist and Head Science Writer at The Debrief. Follow and connect with him on X, learn about his books at plainfiction.com, or email him directly at christopher@thedebrief.org.
A retired US Air Force fighter pilot claims there is likely an extensive 'paper trail' proving that one of the most infamous UFO encounters of the last three decades really happened.
Colonel Fred Claussen, who was awarded the Distinguished Flying Cross twice during his career, came forward during a press conference in Washington on Tuesday to reveal who would know about the 1996 incident in Varginha, Brazil.
The alleged incident began on January 13, 1996, when locals reported seeing a UFO crash-landing in a field near Varginha, followed by sightings of strange creatures described as walking on two legs, but having oily brown skin and large red eyes.
Despite reports that Brazilian police and military captured at least two aliens, the US Air Force allegedly confiscated all of the wreckage, the bodies of dead aliens, and the survivors of the crash, starting a supposed cover-up that has lasted for 30 years.
To this date, the US military has said there has never been any physical evidence recovered that proves the existence of UFOs or alien life, and has not confirmed that this recovery ever took place.
However, Claussen spoke at an event at the National Press Club organized by investigative filmmaker James Fox, which gathered witnesses and other experts to expose what they claim has been buried about the Varginha crash.
'If true, I am certain that 30 to 40 Americans had direct knowledge of this flight and its purpose,' Claussen said.
Former Air Force pilot Fred Claussen (Pictured) claimed that dozens of US military personnel likely know about an alleged UFO crash landing in Brazil in 1996
Carlos de Souza, witness of an alleged UFO crash in Varginha, Brazil in 1996, speaks at a press conference on UFO encounters at the National Press Club on Tuesday
Often called the 'Brazilian Roswell,' Claussen said that even secret missions involve multiple military personnel and various orders that create documented evidence of their existence.
The decorated Air Force veteran explained that if the US military did launch a UFO recovery mission to Brazil, it would have started within Air Mobility Command at Scott Air Force Base in Illinois.
They would have received the initial order to send a cargo plane, so senior officers there would have known the Varginha crash existed.
'An international flight plan to Brazil is required even if the mission is classified. Paper trail,' Claussen declared.
From there, a specific Air Mobility Wing at Charleston Air Force Base in South Carolina would have received a detailed mission order, selected a crew, and prepared a C-17 aircraft for launch - involving dozens of people.
Pilots, loadmasters, schedulers, and commanders at that base would have been in the loop in 1996, and Claussen was convinced the proof of that UFO crash still exists.
Along with the witnesses from Brazil and other UFO researchers, Claussen then challenged the Air Force personnel who allegedly flew to Brazil to become whistleblowers and expose what really happened in 1996.
'We know this mission happened, and you know it, too. Come forward. The time is now,' the former pilot said.
Witnesses claimed that a cigar-shaped object crashed on a local farm and was quickly recovered by Brazilian military and police
According to witnesses, multiple non-human aliens were still alive and were captured after the crash in Varginha, Brazil in January 1996
The incident 30 years ago played out over several days and also involved the death of a Brazilian police officer who was allegedly contaminated by one of the aliens.
On January 13, 1996, witnesses in Varginha spotted a cigar-shaped UFO that looked damaged and had white smoke pouring out of it.
The supposed spacecraft crashed on a farm outside the city, where witness Carlos de Souza, who attended Tuesday's press conference, found scattered debris and a strange, lightweight metal that reshaped itself after being crumpled.
However, soldiers quickly arrived and de Souza claimed he was ordered to leave at gunpoint. Later, two mysterious men in suits allegedly threatened him at a gas station to stay silent about what he saw.
'You saw nothing. You know nothing. Or you will have problems for the rest of your life,' de Souza recounted about his meeting with the unidentified men.
Days later, on January 20, the three young women encountered a reportedly scared, non-human being in a vacant lot that had a strong ammonia smell.
Brazilian military and police captured at least two of these beings that same day, including one grabbed bare-handed by officer Marco Eli Chereze, whose skin was scratched during the capture.
Chereze developed a deadly infection from the alleged scratch and died weeks later.
Dr Armando Monteiro, a forensic pathologist who performed the autopsy on Chereze, revealed during the press conference that he discovered a rare, aggressive bacterium that doctors suspected might have been of alien origin in the officer's wound.
Soon after, the beings and debris were reportedly transported to a Brazilian airport, where the secret C-17 cargo plane allegedly loaded them and flew back to America.
Although witnesses have maintained that everything they saw was real, no evidence from the reported crash site has been seen again, and the death of Chereze was reportedly listed as an infection due to the Earth bacteria strain Staphylococcus schleiferi.
For over two decades, millions of people volunteered the computational capacity of their computers to help UC Berkeley scientists in their search for extraterrestrial intelligence (SETI).
The goal of the project, called SETI@home, was to trawl through data collected by the Arecibo Observatory in Puerto Rico for signs of unusual radio signals from the cosmos. It was a powerful example of “distributed computing,” which relies on a huge network of individual computers — but whether the search has borne any fruit remains unclear as scientists continue to analyze the wealth of data.
SETI@home concluded after 21 years in 2020, producing a whopping 12 billion detections, according to a UC Berkeley press release, making it “one of the most popular crowd-sourced research projects ever.”
Over the years, researchers whittled down the data to just 100 signals that were “worth a second look” by eliminating radio frequency interference and noise with the help of a supercomputer. Since July, they’ve been using China’s Five-hundred-meter Aperture Spherical Telescope (FAST), in the hopes of catching another glimpse of the identified targets.
Unfortunately, the Arecibo Observatory — once the world’s largest radio telescope — collapsed during a storm in 2020, and is being decommissioned.
Even if the project never leads to first contact with an intelligent extraterrestrial species, it doesn’t mean SETI@home was a waste of time. Researchers are still trawling through the FAST data, but early conclusions of the project and its effectiveness have already resulted in twopapers that were published last year in The Astronomical Journal.
“If we don’t find ET, what we can say is that we established a new sensitivity level,” said project cofounder David Anderson in a statement. “If there were a signal above a certain power, we would have found it.”
The team is hoping to inspire a successor to the crowdsourced research project, while applying what they’ve learned.
“Some of our conclusions are that the project didn’t completely work the way we thought it was going to,” Anderson said. “And we have a long list of things that we would have done differently and that future sky survey projects should do differently.”
Astronomer and project director Eric Korpela also pointed out that the considerable amount of radio interference, which can emanate from other sources, including radio and TV broadcasts and even microwave ovens, could seriously mess with the data.
“We have to do a better job of measuring what we’re excluding,” he said. “Are we throwing out the baby with the bath water? I don’t think we know for most SETI searches, and that is really a lesson for SETI searches everywhere.”
Given the lack of a smoking gun after trawling “billions and billions” of stars in the Milky Way, the project left the alien-hunting organizers somewhat deflated.
“We are, without doubt, the most sensitive narrow-band search of large portions of the sky, so we had the best chance of finding something,” Korpela explained. “So yeah, there’s a little disappointment that we didn’t see anything.”
However, the researcher hasn’t given up on the idea, particularly given the immense advancements in computer power and improved internet connections.
“I think that you could still get significantly more processing power than we used for SETI@home and process more data because of a wider internet bandwidth,” Korpela said. However, “the biggest issue with such a project is that it requires personnel, and personnel means salaries. It’s not the cheapest way to do SETI.”
And plenty of what-ifs remain, especially considering the limitations of the SETI@home project.
“There’s still the potential that ET is in that data and we missed it just by a hair,” he pondered.
Assuming our solar system’s newest interstellar object isn’t an alien mothership sent here to menace us, humankind still hasn’t spotted any signs of extraterrestrial life, let alone intelligence — which, given how incalculably vast the universe is, is strange. With all the potential homes for potential alien civilizations, why aren’t we seeing any evidence of them?
You’ve probably heard of the name for this conundrum: the Fermi Paradox. And you’ve probably heard of more than a few solutions to it, too.
There’s the infamous zoo hypothesis, which supposes that advanced aliens know about our planet but stay away to let us evolve naturally.
Or maybe you subscribe to spookier ones like the vulnerable worlds hypothesis, which holds that there may be a certain type of ominous technological innovation that humankind doesn’t even know about yet which always destroys any civilization advanced enough to develop it.
Or perhaps the universe is a kind of dark forest, with plenty of alien civilizations, but all too scared to show themselves out of fear of being annihilated by an even more advanced and bloodthirsty interstellar species.
But here comes the party pooper. In a new yet-to-be-peer-reviewed paper, NASA astrophysicist Robin Corbet proposes an outlook of “radical mundanity” that basically banishes these fun ideas back to the realm of speculative scifi. The Milky Way actually contains a modest amount of civilizations, according to this hypothesis, which was spotlighted by The Guardian — but the aliens aren’t busy tunneling wormholes or probing singularities. Instead, they’re only slightly more technologically advanced than we are, get bogged down by the same limitations when trying to look for fellow intelligent beings, and eventually give up on exploring the cosmos.
“The idea is that they’re more advanced, but not much more advanced. It’s like having an iPhone 42 rather than an iPhone 17,” Corbet, a senior research scientist at the University of Maryland, Baltimore County and NASA’s Goddard Space Flight Center, told the newspaper. “This feels more possible, more natural, because it’s not proposing anything very extreme.”
This mundane view explains why we aren’t seeing any technosignatures, or evidence of alien technology from afar. The aliens just don’t have what it takes to build huge megastructures that we could see with our telescopes, like a Dyson swarm that enshrouds a star to harvest its energy.
And while they might have the technological capability to travel to other stars, perhaps even with robotic probes, it’d be a painstakingly slow and enormously expensive undertaking, just like it would be for us. And so, finding no other civilizations along the way, they decide it’s not worth the cost. Ditto for powering a huge beacon for beaming a “we’re here!” signal out into the cosmos.
“They don’t have faster-than-light, they don’t have machines based on dark energy or dark matter, or black holes,” Corbet told The Guardian. “They’re not harnessing new laws of physics.”
It’s a sobering rebuff to some of our more fantastical theories of life in the cosmos. But not everyone’s a fan. Michael Garrett, the director of the Jodrell Bank Centre for Astrophysics, told The Guardian he liked the “fresh perspective,” but not much else.
“It projects a very human-like apathy on to the rest of the cosmos,” Garrett said. “I find it hard to believe that all intelligent life would be so uniformly dull.”
In fact, his personal hypothesis, detailed in a study accepted for publication in Acta Astronautica, couldn’t be more diametrically opposed to Corbet’s.
“I lean towards a more adventurous explanation of the Fermi paradox: that other, post-biological civilisations advance so rapidly that they slip beyond our capacity to perceive them,” Garrett told The Guardian. “I hope I’m right, but I could very well be wrong. Nature always has some kind of surprise for us around the corner.”
Soon we will witness a truly spectacular event. For the first time since 1972, a rocket carrying four astronauts will embark on a journey to the Moon. We will explain when the Artemis II flight is scheduled to take place and how it will proceed.
Launch windows for the flight to the Moon
NASA cannot launch a mission to the Moon at any given time. The launch date is determined by orbital mechanics and the relative positions of celestial bodies, which allows the Moon’s gravity to be used to return the spacecraft with astronauts to Earth without using its main engine (this reduces the risks for the expedition).
Possible launch dates for the Artemis II mission. Source: NASA
The closest launch windows for the Artemis II flight to the Moon will be open from February 6 to 8 and February 10 to 11. If the SLS rocket cannot be launched within these time frames, the next launch windows will be open on the following dates:
March – 6th, 7th, 8th, 9th, and 11th.
April – 1st, 3rd, 4th, 5th, 6th, and 30th.
It is interesting to note that almost all of the upcoming ballistic windows suggest that Artemis II will only be launched at night. Theoretically, the mission could be launched at dawn at the end of the ballistic window on April 1. The window on April 30 provides an opportunity to launch shortly before sunset.
Launch of the SLS rocket. Source: Bill Ingalls/NASA
The exact launch date will depend not only on the technical readiness of the SLS rocket and Orion spacecraft, but also on several external factors, such as weather conditions, wind speed, and cloud cover. Solar activity will also be taken into account. The Artemis II flight will take place outside the Earth’s magnetic field. If, during the launch period, the Sun produces powerful flares or there is a high probability of them occurring, NASA will almost certainly postpone the flight.
Artemis II launch
Now let’s talk in more detail about how the Artemis II flight itself will proceed. Approximately 3.5 hours before launch, the four astronauts will board the Orion spacecraft, after which technicians will close the spacecraft hatch. The first stage engines of the SLS rocket will be activated 6 seconds before launch – at this stage, the launch can still be canceled. Once the side solid rocket boosters ignite, this will no longer be possible.
Artemis II mission launch diagram. Source: NASA
The separation of the SLS solid rocket boosters will occur at 129 seconds into the flight, when the rocket will be at an altitude of 47.5 km. Approximately one minute after that, the “tower” – a solid rocket motor installed at the top of the nose cone – will be jettisoned. It is used as an emergency rescue system: in the event of an emergency, the rocket must “pull out” the capsule with the astronauts and take it away from the SLS. The separation will occur at an altitude of 87 km, which is slightly below the Kármán line, accepted as the boundary of outer space.
At 495 seconds into the flight, the first stage will separate. At this point, Orion will still be on a suborbital trajectory. When the spacecraft reaches apogee, the upper stage of the SLS will be activated. An hour later, another altitude increase maneuver will be performed. They will bring Orion into an elongated near-Earth orbit with a perigee altitude of 185 km and an apogee altitude of 70,000 km. For comparison, the ISS is in a circular orbit at an altitude of approximately 415 km.
In orbit around Earth
Upon completion of the maneuvers, Orion will separate from the upper stage, after which the next stage of the flight will begin, lasting 23 hours. Initially, the astronauts will switch the spacecraft to manual control and perform a series of approaches to the upper stage of the SLS. These operations will provide a unique experience that cannot be gained on Earth and will yield valuable data that will be useful in planning future missions involving docking and undocking in lunar orbit.
Artemis II mission flight plan. Source: NASA
After completing the rendezvous, the crew will return control of Orion to mission controllers and spend the remaining time checking the functionality of all spacecraft components. Key attention will be paid to the life support system. The astronauts will also test communications and navigation. Orion will briefly leave the coverage area of GPS and TDRS satellites, which will allow NASA to test the technical capabilities of its Deep Space Network.
At this stage, a payload will also be deployed – several CubeSats provided by countries that are parties to the Artemis Accords.
If the checks do not reveal any significant problems, NASA will give the green light to the next stage of the mission – the flight to the Moon. On the second day, Orion will activate its main engine and perform a maneuver that will send it towards our planet’s satellite. The spacecraft will follow a trajectory resembling a giant figure eight. As for the upper stage of the SLS, NASA will also activate its engine and direct it into the atmosphere above an uninhabited area of the Pacific Ocean to prevent it from becoming space debris.
Flight to the Moon and back
During the flight to the Moon, the spacecraft will perform three minor course corrections. Before the crew goes to sleep on the fifth day of the flight, Orion will enter the Moon’s sphere of influence, where its gravitational pull will become stronger than Earth’s gravitational pull.
The Orion spacecraft against the backdrop of the Moon. Source: NASA
The exact distance at which the Artemis II crew will fly past the Moon will depend on the launch date. In each of the possible ballistic windows, the Moon will be in a different location, and the flyby distance will vary accordingly: it can range from 6,500 to 13,000 km. This is hundreds of thousands of kilometers closer than any human has come to our planet’s satellite since 1972. At this distance, the Moon will appear to the crew to be the size of a basketball held at arm’s length.
The closest approach will occur when Orion flies over the far side of the Moon. At that moment, depending on the launch time, the crew will lose contact with Earth for 30 to 50 minutes. During this interval, the astronauts will take photographs and videos of the far side of the Moon, as well as conduct observations. At approximately this time, the Artemis II crew is expected to break the record for distance from Earth, set by Apollo 13.
The Artemis II flight path is designed so that the crew will not need to perform any maneuvers using the main engine, eliminating the risk of an accident and the possibility of them getting “stuck” near the Moon. When the spacecraft rounds the Moon and leaves its sphere of influence, Earth’s gravity will “catch” it and direct it toward our planet. As during the flight to the Moon, the crew will perform three small course corrections during this leg for more accurate guidance. The last maneuver will be performed on the 10th day of the flight, five hours before landing.
Shortly before entering the atmosphere, the astronauts will separate the Orion service module. This will expose the heat shield of the crew capsule. At its peak, it will be exposed to temperatures of up to 2,800 °C. This is about a thousand degrees higher than missions returning from the ISS. This difference is because Orion will enter the Earth’s atmosphere at a much higher second cosmic velocity. As the heated plasma completely envelops the spacecraft, NASA will lose all contact with it for several minutes.
Landing of the Orion spacecraft capsule. Source: NASA
If everything goes well, Orion will first deploy two brake parachutes, followed by three main parachutes. The capsule with four astronauts will splash down in the Pacific Ocean, after which it will be picked up by ships.
After returning
The Artemis II mission is largely a test mission. It is intended to demonstrate the reliability of Orion and its ability to support interplanetary missions. The flight will also have enormous symbolic significance. For the first time in more than half a century, humans will leave the vicinity of our planet. The Artemis II mission could help to increase the popularity of space exploration.
Starship HLS on the Moon (concept). Source: SpaceX
Artemis II will pave the way for the next mission, Artemis III, which plans to land two astronauts on the south pole of the Moon. It is currently scheduled for 2027. However, in reality, the date will almost certainly change, as many elements of the expedition are not yet ready – from the Starship HLS spacecraft to the lunar spacesuits. However, the success of Artemis II may serve as a significant stimulus to accelerate its preparation.
Hand stencil made almost 68,000 years ago is the oldest cave art ever found
Hand stencil made almost 68,000 years ago is the oldest cave art ever found
“It really just shows how long people have been making rock art in that part of the world,” Adam Brumm, a professor of archaeology, said of the find in Indonesia. “It’s a very long time.”
Handprints reveal sharpened fingertips in the Maros region of Sulawesi, Indonesia.
The world’s oldest known example of cave art, dating back at least 67,800 years, has been discovered by researchers studying handprints in Indonesia.
The find, along with others recently made in the Southeast Asian nation, helps scientists trying to determine when and where early humans first learned to make art, and at what point their art became more complex.
The reddish hand stencils, though faded and barely visible, were found inside the Liang Metanduno limestone cave on Muna, an island off the larger eastern Indonesian island of Sulawesi. One of them was found to be at least 67,800 years old.
The team also identified animal figures inside a cave in Sulawesi, Indonesia
Maxime Aubert
Indonesian and Australian researchers said the stencils were made by blowing pigment onto a hand pressed against the rock surface, leaving an outline. Fingertips reshaped to appear more pointed suggest that the hands belonged to humans, possibly connected to the ancestors of the first Australians.
The paintings were dated by analyzing mineral crusts that had gradually formed on top of them.
The finding “is pretty extraordinary, because usually rock art is very difficult to date, and it doesn’t date back to anywhere near that old,” said Adam Brumm, a professor of archaeology at Griffith University in Brisbane and a co-author of the study published Wednesday in the journal Nature.
Indonesian scientists Adhi Agus Oktaviana, left, and Shinatria Adhityatama studying handprints on the walls of the cave.Maxime Aubert via AP
The hand stencil is more than 15,000 years older than a painting in another cave on Sulawesi that the same team dated in 2024. That painting, which depicted three human-like figures interacting with a pig, is thought to be about 51,200 years old.
“I thought we were doing pretty well then, but this one image just completely blew that other one away,” Brumm said.
“It really just shows how long people have been making rock art in that part of the world,” he said. “It’s a very long time.”
Researchers hope to find even older art, including storytelling art, in and around Indonesia, much of which remains archaeologically unexplored, he added.
Liang Metanduno is a well-known site for cave art that is open to tourists. But most of the art found so far is paintings depicting chickens and other domesticated animals that are thought to be much more recent, about 4,000 years old.
In 2015, Indonesian rock art specialist Adhi Oktaviana, the paper’s lead author, noticed faint images behind more recent ones that he thought could be hand stencils.
“No one had ever observed them before. No one even knew that they were there,” Brumm said. “But Adhi spotted them.”
For generations, researchers studying Ice Age cave paintings in places like France and Spain, which are about 30,000 to 40,000 years old, “thought, wow, this is really where true art began, true modern human artistic culture,” Brumm said.
Recent discoveries in Indonesia, he said, show that humans outside Europe were making “incredibly sophisticated” cave art tens of thousands of years earlier, “before our species ever even set foot in that part of the world.”
Brumm said the discovery was also interesting because it may shed light on when the first humans arrived in his home country of Australia.
Though Aboriginal peoples are widely accepted as being in Australia for at least 50,000 years, one archaeological site in the country is said to be 65,000 years old.
“Now that we’re finding rock art dating to 67-68,000 years ago on the island of Sulawesi, which is essentially on Australia’s doorstep, it does make it considerably more likely that modern humans indeed were in Australia at least 65,000 years ago,” Brumm said
67,800-Year-Old Hand Print May Be World's Oldest Rock Art Found in Indonesian Cave
The world's oldest cave art: Scientists discover 67,000–year–old painting of a red hand in Indonesia – and it could rewrite the origins of human creativity
The world's oldest cave art: Scientists discover 67,000–year–old painting of a red hand in Indonesia – and it could rewrite the origins of human creativity
A painting of a red hand found in a cave in Indonesia is believed to be the world's earliest rock art.
Discovered in a cave on the island of Sulawesi, experts think the stencil was made by our species at least 67,800 years ago.
This is 15,000 years earlier than the previous discovery in the same region.
While the stencil was likely based on a human hand, it was altered before being used on the cave wall.
Its creator had deliberately narrowed the negative outlines of the fingers – creating the impression of a claw–like hand.
According to researchers from Griffith University, the finding could rewrite the origins or human creativity.
What's more, its discovery could advance our understanding of exactly how and when Australia – which is just south of Sulawesi – first came to settled.
'It is very likely that the people who made these paintings in Sulawesi were part of the broader population that would later spread through the region and ultimately reach Australia,' explained team lead Dr Adhi Agus Oktaviana.
A painting of a red hand discovered in a cave in Indonesiais believed to be the world's earliest rock art
Discovered in a cave on the island of Sulawesi, experts think the stencil was made by our species at least 67,800 years ago
Beyond rewriting the origins of human creativity, the findings could also shed light on the settlement of Sahul – the supercontinent that encompassed what is now Australia, Tasmania, and New Guinea – which is just south of Sulawesi
The hand stencil was found preserved in limestone caves in southeastern Sulawesi, on the satellite island of Muna.
Using advanced uranium–series dating techniques, the team analysed microscopic mineral deposits to understand exactly when the stencil was created.
The results revealed a minimum age of 67,800 years – making it the oldest reliably dated cave art ever discovered.
An analysis of the stencil itself suggests it was deliberately altered to give the impression of a claw.
However, the symbolic meaning of this remains unclear.
'This art could symbolise the idea that humans and animals were closely connected, something we already seem to see in the very early painted art of Sulawesi, with at least one instance of a scene portraying figures that we interpret as representations of part–human, part–animal beings,' Professor Adam Brumm, co–lead author of the study said.
Alongside the hand stencil, the researchers found paintings of a much more recent origin – around 20,000 years.
This suggests the Muna cave was used for making art over an 'exceptionally long period', according to the researchers.
The hand stencil was found preserved in limestone caves in southeastern Sulawesi, on the satellite island of Muna
Using advanced uranium–series dating techniques, the team analysed microscopic mineral deposits to understand exactly when the stencil was created. The results revealed a minimum age of 67,800 years – making it the oldest reliably dated cave art ever discovered
'It is now evident from our new phase of research that Sulawesi was home to one of the world's richest and most longstanding artistic cultures, one with origins in the earliest history of human occupation of the island at least 67,800 years ago,' said Professor Maxime Aubert, co–lead author of the study.
Beyond rewriting the origins of human creativity, the findings could also shed light on the settlement of Sahul – the supercontinent that encompassed what is now Australia, Tasmania, and New Guinea – which is just south of Sulawesi.
Until now, scientists have been divided on the timing and route for humans' arrival.
Some have suggested they arrived at least 65,000 years ago, while others are adamant it's more like 50,000 years ago.
Meanwhile, certain studies indicate a northern route to the New Guinea portion of this landmass via Sulawesi and the 'Spice Islands', while others have put forward a more southerly route directly to the Australian mainland via Timor or adjacent islands.
The new cave art helps to settle both of these debates – suggesting the first Australians arrived at least 65,000 years ago via the northern route.
'With the dating of this extremely ancient rock art in Sulawesi, we now have the oldest direct evidence for the presence of modern humans along this northern migration corridor into Sahul,' said the study's co–lead author, Professor Renaud Joannes–Boyau.
The most famous cave art can be found in Spain and France, but it exists throughout the world.
The famed Upper Palaeolithic cave art of Europe dates back to around 21,000 years ago.
In recent years scholars have recorded cave art found in Indonesia that is believed to be about 40,000 years old - predating the most popular European cave art.
Hand stencils found in the El Castillo cave in Cantabria, Spain
Expert Shigeru Miyagawa authored a study in 2018 which examined cave art to try to shed light on how human language evolved.
He said: 'Cave art is everywhere. Every major continent inhabited by homo sapiens has cave art.
'You find it in Europe, in the Middle East, in Asia, everywhere - just like the human language.'
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67,800-Year-Old Hand Print May Be World's Oldest Rock Art Found in Indonesian Cave
Archaeologists think this hand stencil (highlighted in the center of this 3-D rendering of the art in order to better see the barely there image) was made on the walls of a cave by Homo sapiens more than 67,000 years ago. It's now almost obscured by encrustation and later paintings.
The star J0705+0612 was a mystery to scientists for some time. Similar to our Sun, it suddenly dimmed. Now scientists know that the reason for this is a dust cloud containing large amounts of metal and orbiting this star.
A metallic cloud around a star. Source: phys.org
Unexpected occultationof a star
Strong winds of evaporated metals were discovered in the enormous cloud that obscured the star’s light for nearly nine months. This discovery, made using the Gemini South telescope in Chile, part of the Gemini International Observatory, provides a rare glimpse into the chaotic and dynamic processes that still shape planetary systems long after their formation.
In September 2024, a star 3,000 light-years away suddenly became 40 times dimmer than usual and remained so until May 2025. The star J0705+0612 is similar to our Sun, so the sharp decline in its brightness caught the attention of Nadia Zakamska, a professor of astrophysics at Johns Hopkins University. “Stars like the sun don’t just stop shining for no reason,” she says, “so dramatic dimming events like this are very rare.”
Identifying the cause of dimming
Recognizing the opportunity to study this phenomenon over many months, Zakamska and her team began observations using the Gemini South telescope located on Cerro Pachón in Chile, as well as the 3.5-meter Apache Point Observatory telescope and the 6.5-meter Magellan telescope.
By combining their observations with archival data on J0705+0612, the team determined that the star was occulted, or temporarily obscured, by a huge, slow-moving cloud of gas and dust. They estimate that the cloud is about two billion kilometers from its parent star and has a diameter of about 200 million kilometers.
The data indicate that this cloud is gravitationally bound to a secondary object, which itself orbits the star at the outer limits of the planetary system. Although the nature of this object remains unknown, it is thought to be massive enough to hold the cloud together. Observations limit its mass to at least several times that of Jupiter, although it may be larger. Possibilities range from a planet to a brown dwarf to a very low-mass star.
If the mysterious object is a star, the cloud will be classified as a secondary disk — a disk of debris orbiting around the less massive member of a binary system. If the object is a planet, it will be a circumplanetary disk. In any case, direct observation of a star obscured by a disk surrounding a secondary object is an extremely rare phenomenon, with only a few known examples.
Cloud composition analysis
To study the cloud’s composition, the team used Gemini South’s most advanced instrument, the Gemini High-resolution Optical Spectrograph (GHOST). In March 2025, GHOST observed the occultation for just over two hours, breaking down the star’s light into a spectrum that revealed the chemical elements present in the intervening material.
GHOST data detected several metals — elements heavier than helium — in the cloud. More remarkably, the high precision of the spectra allowed the team to directly measure how the gas moves in three dimensions. This is the first time astronomers have measured the internal motions of gas in a rotating disk around a secondary object, such as a planet or low-mass star. The observations reveal a dynamic environment with winds of gaseous metals, including iron and calcium.
“The sensitivity of GHOST allowed us not only to detect gas in this cloud, but also to actually measure how it moves,” says Zakamska. “This is something we have never been able to do before in such a system.”
How did the dust cloud form?
Precise measurements of wind speed and direction show that the cloud is moving separately from its parent star. This, combined with the duration of the occultation, further confirms that the occulting object is a disk around a secondary object and that it is orbiting outside the parent star’s stellar system.
The source emits excess infrared radiation, usually associated with disks around young stars. However, J0705+0612 is more than two billion years old, which means that the disk is unlikely to be the remnants of debris from the early stages of planet formation in the system. So how did it form?
Astronomers suggest that it was formed after two planets collided at the outer edges of this star’s planetary system, ejecting dust, rocks, and debris that formed a massive cloud passing in front of the star.
This discovery highlights how new technologies can provide new insights into the Universe. GHOST has opened a new window for studying hidden phenomena in distant star systems, and the data obtained provide valuable clues about the long-term evolution of planetary systems and how disks around old stars may form.
Scientists say that the case of star J0705+0612 shows that even in mature planetary systems, dramatic, large-scale collisions can still occur.
Researchers at Columbia University’s School of Engineering and Applied Science have designed a robot capable of displaying realistic lip motions for speech and singing.
Past research has shown that most people focus on lip movements during face-to-face conversations. However, creating robots that can replicate these lip movements continuously presents a challenge, and even the most advanced robots on the market today produce, at best, only muppet-like gestures when communicating.
Now, the Columbia University team, led by Hod Lipson, James and Sally Scapa, a Professor of Innovation in the Department of Mechanical Engineering, is producing robots that aim to overcome these limitations. However, at this stage, the team’s creations still appear lifeless, or even unsettling, because their facial expressions don’t match human expectations, thereby invoking a phenomenon known as the “Uncanny Valley.”
The team’s work, detailed in a recent study published inScience Robotics, reveals how their robot used its abilities to articulate words in a variety of languages and even sing a song from its AI-generated debut album, “Hello World.”
Into the“Uncanny Valley”
So what, exactly, is the “Uncanny Valley”? As Lipson explained to The Debrief in an email, “It’s that creepy feeling you get when you watch a robot trying to look human, but missing something essential.”
“I think that half of the problem is lip motion, because half the time humans engage in face-to-face conversation, they gaze at the speaker’s lips,” Lipson said. “To date, robots do not have lips (most don’t even have a face). Our robot _EMO_ is far from perfect, but I think it’s on the path to crossing the uncanny valley.”
Unlike traditional approaches, which rely on strict programming and predefined rules, the Columbia team’s robot learns by observing humans in action. Initially, the robot was designed to practice in front of a mirror, experimenting with its 26 facial muscles to help it “learn” how its own face moves. Once familiar with its own expressions, it watched hours of videos of humans talking and singing, learning about the exact timing and coordination of lip movements.
“We don’t program the motors directly. Instead, the robot’s AI learns over time how to move the motors by watching humans and then watching itself in the mirror, and comparing,” Lipson said. Following such training, the robot demonstrated the ability to translate audio directly into synchronized lip-motor action.
“Robots get better the more they interact with humans,” Lipson explained in a statement. “This learning-based approach allows the robot to continually refine its expressions, much like a child learns by observing and imitating adults.”
“The robot’s facial motors are scattered under the robot’s face, and they are designed to enable the robot to make a large variety of facial gestures, including lip motion, smiling, and other motions,” Lipson added.
Achieving this type of humanlike lip movement requires flexible facial “skin” and many small motors capable of rapid, silent movement. Second, the intricate patterns of lip motion are determined by vocal sounds and phonemes (a type of choreography humans use to perform these movements effortlessly through dozens of facial muscles).
By combining a highly actuated face with a vision-to-action learning model, the Columbia robot overcomes these hurdles. It first explored random facial expressions, then expanded and refined its ability by watching humans, building a model that connects audio cues to precise motor movements. At its current state, the technology still requires a few improvements, as indicated by challenges the robot experiences with making “B” and “W” sounds. Nonetheless, the system has made leaps and bounds beyond the speaking capabilities of other robots currently on the market.
“This is the missing link in robotics,” said Lipson. “Much of humanoid development focuses on walking or grasping, but facial [expression] is essential for human connection.”
“The more the robot observes human interaction, the better it captures nuanced facial gestures, deepening emotional connection,” noted Yuhang Hu, a researcher at Creative Machines Lab, Columbia University.
Researchers currently see applications for such lifelike robots across a range of fields, including entertainment, education, medicine, and elder care. However, Lipson expressed cautious optimism, noting that while the technology demonstrates promise, there are also concerns that must be navigated as it develops.
“This technology is powerful,” Lipson said. “We must advance carefully to maximize benefits while minimizing risks.”
“But the potential to unlock human-robot connection is truly exciting,” Lipson added.
Chrissy Newton is a PR professional and the founder of VOCAB Communications. She currently appears on The Discovery Channel and Max and hosts the Rebelliously Curious podcast, which can be found on YouTube and on all audio podcast streaming platforms. Follow her on X: @ChrissyNewton, Instagram: @BeingChrissyNewton, and chrissynewton.com. To contact Chrissy with a story, please email chrissy @ thedebrief.org.
According to the so–called glacial transport theory, the ice that once covered ancient Britain conveniently carried the stones to the Salisbury Plain.
However, scientists have now found concrete evidence that suggests the megaliths must have been moved by humans.
Using cutting–edge mineral fingerprinting techniques, geologists from Curtin University showed that no glacial material ever reached the Salisbury Plain.
If the rocks were indeed carried by ice, they would have left behind a breadcrumb trail containing millions of microscopic mineral grains.
But when the researchers looked at Wiltshire's sand, they found that none had been moved there during the last ice age, 20,000 to 26,000 years ago.
Lead author Dr Anthony Clarke told the Daily Mail: 'Our findings make glacial transport unlikely and align with existing views that the megaliths were brought from distant sources by Neolithic people using methods like sledges, rollers, and rivers.'
Scientists looked at grains of the minerals zircon (pictured) and apatite, which act as geological clocks by trapping radioactive uranium. If glacial transport is correct, the age of these grains should match the ages of rocks in Wales
A few tiny grains of sand may have finally solved one of Stonehenge's most enduring mysteries, as scientists find evidence that the stones were transported by people and not by glaciers
According to the so–called glacial transport theory, the stones that make up Stonehenge were brought to the Salisbury Plain from Wales and Scotland by the movement of massive glaciers
Geologists have traced the two to five–tonne bluestones back to the Preseli Hills in Wales, while the six–tonne altar stone came from a location at least 460 miles (750 km) away in northern Scotland.
This means that Neolithic people would have needed to transport specifically selected stones over hundreds of miles using nothing more than stone and wooden tools.
For some researchers, this idea seems so unlikely that the glacial transport theory seems like a more reasonable alternative.
If ice did cover the Salisbury Plain sometime in the distant past, it would have left traces that should be visible today.
Many of these big traces, like scratches on the bedrock or carved landforms, are either missing or inconclusive around Stonehenge.
But the ice would have also left behind a microscopic trace that scientists should be able to see.
If the stones were brought from their origin at Craig Rhos–y–Felin in north Pembrokeshire (pictured) by ice, these glaciers should have also carried a huge amount of sand that should be detectable in rivers today
The dates of the zircon grains in the Salisbury Plain covered almost half the age of Earth, but almost none matched the fingerprint of rocks from the Stonehenge megaliths' origins
What are the Stonehenge bluestones?
The bluestones of Stonehenge are a collection of smaller, distinctive stones that form the inner circle and horseshoe formations within the monument.
They are named for the bluish tinge they exhibit when freshly broken or wet, despite not always appearing blue in their current state.
These stones are not native to the Salisbury Plain area where Stonehenge is located, and are known to have been sourced from Pembrokeshire in Wales.
Dr Clarke says: 'If large ice sheets had carried bluestone from Wales or northern Britain to Stonehenge, they would also have delivered huge volumes of sand and gravel debris with very distinctive age fingerprints into the local rivers and soils.'
Importantly, this sand contains two minerals called zircon and apatite that can be used like a 'tiny geological clock'.
When zircon and apatite form, crystallising out of magma, they trap tiny amounts of radioactive uranium that decays into lead at a known rate.
By looking at the ratio of uranium to lead, scientists can work out how long ago an individual grain of sand was formed.
Since some rocks, like the Stonehenge megaliths, are made up of lots of these dateable grains, scientists can use this technique to create a geological 'fingerprint'.
'Because Britain's bedrock has very different ages from place to place, a mineral's age can indicate its source,' says Dr Clarke.
'This means that if glaciers had carried stones to Stonehenge, the rivers of Salisbury Plain, which gather zircon and apatite from across a wide area, should still contain a clear mineral fingerprint of that glacial journey.'
The researchers looked at more than 700 zircon and apatite grains, gathered from the rivers near Stonehenge.
Almost all the apatite dated back to around 65 million years ago, when tectonic activity in the Alps forced liquid through the ground and reset the uranium clock. This shows that it was there for millions of years, and had not been freshly carried to the area by ice
Despite covering half the age of the Earth from around 2.8 billion years ago to 300 million years ago, almost none matched the fingerprint of the bluestones' source in Wales or the altar stone's source in Scotland.
The majority of the zircon grains came in a tight band from 1.7 to 1.1 billion years ago, when a blanket of loosely compacted sand called the Thanet Formation covered much of southern England.
Meanwhile, all of the apatite grains were dated to around 60 million years ago, which doesn't match any potential rock source in Britain.
This is because the same tectonic forces that built the European Alps squeezed fluids through the chalk and 'reset' the apatite's uranium clock.
Co–author Professor Chris Kirkland told the Daily Mail: 'Salisbury Plain's sediment story looks like recycling and reworking over long timescales, plus a Paleogene "shake–up" recorded in apatite, rather than a landscape built from major glacial imports.'
'However, the material around Stonehenge doesn't,' says Professor Kirkland.
'So, we conclude Salisbury Plain remained unglaciated during the Pleistocene, making direct glacial transport of the megaliths unlikely.'
This gives strong evidence that the area around Stonehenge was never covered by glaciers, making it extremely unlikely that the rocks were carried to the area by ice rather than by people
This gives 'strong, testable evidence' that the enormous stones were, in fact, dragged all the way to the Salisbury Plain by hand.
Professor Kirkland says: 'You could propose a coastal movement by boat for the long legs, then final overland hauling using sledges, rollers, prepared trackways, and coordinated labour, especially for the largest stones.
Stonehenge is one of the most prominent prehistoric monuments in Britain. The Stonehenge that can be seen today is the final stage that was completed about 3,500 years ago.
According to the monument's website, Stonehenge was built in four stages:
First stage: The first version of Stonehenge was a large earthwork or Henge, comprising a ditch, bank and the Aubrey holes, all probably built around 3100 BC.
The Aubrey holes are round pits in the chalk, about one metre (3.3 feet) wide and deep, with steep sides and flat bottoms.
Stonehenge (pictured) is one of the most prominent prehistoric monuments in Britain
They form a circle about 86.6 metres (284 feet) in diameter.
Excavations revealed cremated human bones in some of the chalk filling, but the holes themselves were likely not made to be used as graves, but as part of a religious ceremony.
After this first stage, Stonehenge was abandoned and left untouched for more than 1,000 years.
Second stage: The second and most dramatic stage of Stonehenge started around 2150 years BC, when about 82 bluestones from the Preseli mountains in south-west Wales were transported to the site. It's thought that the stones, some of which weigh four tonnes each, were dragged on rollers and sledges to the waters at Milford Haven, where they were loaded onto rafts.
They were carried on water along the south coast of Wales and up the rivers Avon and Frome, before being dragged overland again near Warminster and Wiltshire.
The final stage of the journey was mainly by water, down the river Wylye to Salisbury, then the Salisbury Avon to west Amesbury.
The journey spanned nearly 240 miles, and once at the site, the stones were set up in the centre to form an incomplete double circle.
During the same period, the original entrance was widened and a pair of Heel Stones were erected. The nearer part of the Avenue, connecting Stonehenge with the River Avon, was built aligned with the midsummer sunrise.
Third stage: The third stage of Stonehenge, which took place about 2000 years BC, saw the arrival of the sarsen stones (a type of sandstone), which were larger than the bluestones.
They were likely brought from the Marlborough Downs (40 kilometres, or 25 miles, north of Stonehenge).
The largest of the sarsen stones transported to Stonehenge weighs 50 tonnes, and transportation by water would not have been possible, so it's suspected that they were transported using sledges and ropes.
Calculations have shown that it would have taken 500 men using leather ropes to pull one stone, with an extra 100 men needed to lay the rollers in front of the sledge.
These stones were arranged in an outer circle with a continuous run of lintels - horizontal supports.
Inside the circle, five trilithons - structures consisting of two upright stones and a third across the top as a lintel - were placed in a horseshoe arrangement, which can still be seen today.
Final stage: The fourth and final stage took place just after 1500 years BC, when the smaller bluestones were rearranged in the horseshoe and circle that can be seen today.
The original number of stones in the bluestone circle was probably around 60, but these have since been removed or broken up. Some remain as stumps below ground level.
Ever since their discovery more than 165 years ago, massive fossilized structures left by an organism known as Prototaxiteshave proven impossible to categorize.
Researchers in the UK have suggested in a recently published study that there's a very good reason these oddities don't fit neatly on the tree of life – they belong to a branch all of their own, with no modern equivalent.
Some 400 million years ago, the swamps of the late Silurian period would have sprouted a mix of horsetails, ferns, and other prototype plants that look positively alien today.
Among them stretched 8-meter (26-foot) tall towers that defy easy identification. Wide and branchless, these organisms may have been a form of algae or ancient conifer, researchers suspect, based on what little evidence remains.
Fossils found on the shores of Gaspé Bay in Quebec, Canada, were initially considered by geologist John William Dawson to be the remains of rotting trees, leading to his naming it 'first conifer' back in the 1850s.
A confocal laser scanning microscopy image revealing the microstructure of a Prototaxites fossil. (Laura Cooper/BlueSky)
Though the name stuck, confusion over the fossil's classification continued until National Museum of Natural History paleontologist Francis Hueber confirmed in 2001 that Prototaxites was indeed most likely an enormous fungus.
That conclusion was backed up years later in 2017 by a subsequent analysis of a fossil fragment assumed to be from the peripheral region of a smaller Prototaxites species named P. taiti.
The 2017 study claimed to identify textures that resembled the fertile structures of today's Ascomycota fungi.
Magnified image of a thin section showing characteristic tubes and medullary spots of P. taiti. (Loron et al., Science, 2026)
Not everybody is convinced, however, given the possibility that the distinct fragments might not have even been connected.
"In the books and books of anatomy written about living fungi, we never find structures like that," University of Edinburgh paleobotanist Alexander Hetherington told Erik Stokstad at Science Magazine.
Hetherington co-led a study on three different P. taiti fragments, concluding there's insufficient evidence to conclude Prototaxites is a fungus at all.
Comparisons between Prototaxites fossils and other organisms put it into a group of its own. (Loron et al., Science, 2026)
Through a review of microscopic anatomy and chemical analysis of its tubular structures, the team of researchers systematically eliminated each and every candidate group, leaving no modern organism with which it might share some kind of ancestral relationship.
Fungi? Rejected thanks to the unique way its anatomy connects.
A plant or algae? Not likely given its chemical composition.
A mix of the two, such as a lichen? Not with that anatomy.
Some bizarre animal? Cell walls say no chance.
"Based on this investigation we are unable to assign Prototaxites to any extant lineage, reinforcing its uniqueness," the researchers claim.
"We conclude that the morphology and molecular fingerprint of P. taiti is clearly distinct from that of the fungi and other organisms preserved alongside it in the [Devonian deposit], and we suggest that it is best considered a member of a previously undescribed, entirely extinct group of eukaryotes."
What might have happened to this long-dead group of organisms is anybody's guess. Further reviews may even return the mystifying group back to its box among ancient fungi.
Without similar specimens to relate them to, Prototaxites may simply remain a fossil anomaly – a reminder that evolution is a constant experiment, one littered with far more failures than we may ever have realized.
Scientists have discovered a new form of life, which once stood at a whopping 26ft (eight metres) tall.
Called 'prototaxites', this lifeform lived on Earth around 410 million years ago, before becoming extinct 360 million years ago.
Until now, it was thought to be a form of fungus.
However, a new fossil analysis by scientists from National Museums Scotland suggests that prototaxites were neither a fungus nor a plant.
Instead, experts say they belonged to an 'entirely extinct evolutionary branch of life'.
'It's really exciting to make a major step forward in the debate over prototaxites, which has been going on for around 165 years,' said Dr Sandy Hetherington, co–lead author of the study.
'They are life, but not as we now know it, displaying anatomical and chemical characteristics distinct from fungal or plant life, and therefore belonging to an entirely extinct evolutionary branch of life.
'Even from a site as loaded with palaeontological significance as Rhynie, these are remarkable specimens and it's great to add them to the national collection in the wake of this exciting research.'
Scientists have discovered a new form of life, which once stood at a whopping 26ft (eight metres) tall (artist's impression)
A new fossil analysis by scientists from National Museums Scotland suggests that prototaxites was neither a fungus nor a plant
The fossil was found in the Rhynie chert – a sedimentary deposit near Rhynie, Aberdeenshire.
'The Rhynie chert is incredible,' said Dr Corentin Loron, co–lead author of the study
'It is one of the world's oldest, fossilised, terrestrial ecosystems and because of the quality of preservation and the diversity of its organisms, we can pioneer novel approaches such as machine learning on fossil molecular data.
'There is a lot of other material from the Rhynie chert already in museum collections for comparative studies, which can add important context to scientific results.'
In their new study, the researchers analysed both the chemistry and anatomy of the fossil to understand which group it fits into.
Their results back up the theory that prototaxites were an entirely different form of life, no longer found on Earth.
'As previous researchers have excluded prototaxites from other groups of large complex life, we concluded that prototaxites belonged to a separate and now entirely extinct lineage of complex life,' explained Laura Cooper, co–first author of the study.
'Prototaxites, therefore, represents an independent experiment that life made in building large, complex organisms, which we can only know about through exceptionally preserved fossils.'
In their new study, the researchers analysed both the chemistry and anatomy of the fossil to understand which group it fits into. Their results back up the theory that prototaxites were an entirely different form of life, no longer found on Earth
The fossil was found in the Rhynie chert – a sedimentary deposit near Rhynie, Aberdeenshire
The fossil has now been added to the collections of National Museums Scotland in Edinburgh.
Dr Nick Fraser, keeper of natural sciences at National Museums Scotland, said: 'We're delighted to add these new specimens to our ever–growing natural science collections which document Scotland's extraordinary place in the story of our natural world over billions of years to the present day.
'This study shows the value of museum collections in cutting–edge research as specimens collected over time are, cared for and made available for study for direct comparison or through the use of new technologies.'
For many years, fungi were grouped with, or mistaken for plants.
Not until 1969 were they officially granted their own 'kingdom', alongside animals and plants, though their distinct characteristics had been recognised long before that.
Yeast, mildew and molds are all fungi, as are many forms of large, mushroom-looking organisms that grow in moist forest environments and absorb nutrients from dead or living organic matter.
Unlike plants, fungi do not photosynthesise, and their cell walls are devoid of cellulose.
Geologists studying lava samples taken from a drill site in South Africa discovered fossilised gas bubbles, which contained what could be the first fossil traces (pictured) of the branch of life to which humans belong ever unearthed
Geologists studying lava samples taken from a drill site in South Africa discovered fossilised gas bubbles 800 metres (2,600 feet) underground.
In April 2017, they revealed that they are believed to contain the oldest fungi ever found.
Researchers were examining samples taken from drill-holes of rocks buried deep underground, when they found the 2.4 billion-year-old microscopic creatures.
They are believed to be the oldest fungi ever found by around 1.2 billion years.
Earth itself is about 4.6 billion years old.
Earth itself is about 4.6 billion years old and the previous earliest examples of eukaryotes - the 'superkingdom' of life that includes plants, animals and fungi, but not bacteria - dates to 1.9 billion years ago. The fossils have slender filaments bundled together like brooms (pictured)
They could be the earliest evidence of eukaryotes - the 'superkingdom' of life that includes plants, animals and fungi, but not bacteria.
The previous earliest examples of eukaryotes - the 'superkingdom' of life that includes plants, animals and fungi, but not bacteria - dates to 1.9 billion years ago. That makes this sample 500 million years older.
It was believed that fungi first emerged on land, but the newly-found organisms lived and thrived under an ancient ocean seabed.
And the dating of the find suggests that not only did these fungus-like creatures live in a dark and cavernous world devoid of light, but they also lacked oxygen.
NASA drops a MAJOR hint at the medical emergency that triggered a historic evacuation of astronauts on the ISS - as it reveals a portable ultrasound machine was critical
NASAhas dropped a major hint at the medical emergency that triggered a historic evacuation of astronauts from the International Space Station.
During their first public appearance since returning to Earth, the astronauts revealed that a portable ultrasound machine was 'super handy' during the crisis.
NASA astronaut Mike Fincke, pilot for the ill–fated Crew–11 mission, said that the machine had been used when medical issues arose on January 7.
'Having a portable ultrasound machine helped us in this situation; we were able to take a look at things that we didn't have,' he explained.
While Mr Fincke did not elaborate on the medical emergency, the fact that an ultrasound was used suggests two likely reasons.
Firstly, ultrasound scans are often used to examine how astronauts' cardiac systems are functioning in low gravity.
The other main use for ultrasound in space is to monitor astronauts' eye health.
However, ultrasound can also be used as a general diagnostic tool in a vast number of medical cases – so it remains unclear what the medical emergency was, or how ultrasound proved useful.
NASA astronaut Mike Fincke (pictured), pilot for the ill–fated Crew–11 mission, has shared a major hint as to why the space agency was forced to evacuate the ISS
The members of Crew–11 were forced to return to Earth a month ahead of schedule due to an unspecified medical emergency. Left to Right: Russian cosmonaut Oleg Platonov, NASA astronauts Mike Fincke and Zena Cardman, and Japanese astronaut Kimiya Yui
During the press conference, Mr Fincke explained that the crew had lots of experience using the ultrasound machine to track changes in the human body, so 'when we had this emergency, the ultrasound machine came in super handy'.
The Crew–11 pilot even went so far as to claim that all future spaceflights should be equipped with portable ultrasound machines.
'Of course, we didn't have other big machines that we have here on planet Earth,' he said.
'We do try to make sure that everybody before we fly are really, really not prone to surprises. But sometimes things happen and surprises happen, and the team was ready … preparation was super important.'
The Crew-11 astronautas splashed back to Earth last Thursday, following NASA's first medical evacuation in 65 years of spaceflight, and the first time that the ISS has ever been evacuated.
That crew included NASA astronauts Zena Cardman, Mike Fincke, Japanese astronaut Kimiya Yui, and Russian cosmonaut Oleg Platonov.
The ISS is equipped with a modified off–the–shelf ultrasound machine called Ultrasound 2 that is primarily used for cardiac and ocular scans. Pictured: NASA astronaut Mike Fossum uses the Ultrasound 2 to scan the heart of crewmate Satoshi Furukawa
Health issues that can arise on the ISS
Blood clots
Bone and muscle atrophy
Loss of vision
Radiation damage
Circadian rhythm disruption
Accelerated ageing
General health decline
Prior to their departure, NASA's chief health and medical officer, Dr James Polk, said that the astronaut was 'absolutely stable' and that this was not an 'emergent evacuation'.
Dr Polk added: 'We're not immediately disembarking and getting the astronaut down, but it leaves that lingering risk and lingering question as to what that diagnosis is, and that means there is some lingering risk for that astronaut onboard.'
NASA has remained extremely reticent to discuss any of the details of the medical emergency or which member of the crew it might have affected.
However, this latest update from Mr Fincke is the first clue as to what might have happened.
Ultrasound imaging sends a beam of soundwaves into the body and records how they bounce back to a receiver.
As the sound moves at different speeds through different types of tissue, you can 'see' inside the body without using any invasive methods.
Since 2011, the ISS has carried a modified off–the–shelf ultrasound machine called Ultrasound 2 that is used in both biomedical research and routine health checkups.
On Earth, sound has a huge array of uses, ranging from diagnosing gallbladder diseases and kidney stones to checking the health and gender of unborn babies.
One of the main uses for the ultrasound scanner is to monitor the cardiac and vascular health of astronauts, who are more at risk of conditions like blood clots, hardening arteries, and changes in blood pressure.
Pictured: NASA astronaut Kevin Ford (right) trains with the Ultrasound 2 on Earth
However, on the ISS, Ultrasound 2 is generally used for two main medical issues - cardiac and ocular problems.
In a constant state of free–fall induced microgravity, blood tends to drift up from the astronauts' feet and collect around their head and chest.
In 2020, a NASA astronaut developed a large clot in their internal jugular vein during spaceflight and was forced to stretch the station's dwindling supply of blood thinners to last more than 40 days until supplies could be sent.
The other main use for ultrasound in space is to monitor astronauts' eye health.
As fluids build up in the head, they can cause swelling that triggers a collection of changes in the eye and brain called 'spaceflight–associated neuro–ocular syndrome'.
Increased pressure around the optic nerve causes swelling in the connection between the eye and the brain, and flattening of the back of the eye.
This can lead to blurred vision and long–term damage to an astronaut's vision.
NASA also uses the ultrasound scanner for monthly ocular health checks to ensure astronauts' vision is not being damaged by the buildup of fluids in the head. Pictured: NASA astronaut Leroy Chiao performs an ultrasound examination of the eye on cosmonaut Salizhan Sharipov
Once a month, astronauts on the ISS are required to use Ultrasound 2 to perform ocular scans to keep track of this condition.
NASA's Zena Cardman, who commanded the crew's early return flight with SpaceX, said that the space station is set up as well as it can be for medical emergencies.
She added that NASA 'made all the right decisions' in cancelling the spacewalk, which would have been her first, and prioritising the crew's well–being.
Likewise, Japan's Kimiya Yui said he was surprised how well all the preflight training paid off in dealing with the health concerns.
Mr Yui said: 'We can handle any kind of difficult situation. This is actually very, very good experience for the future of human spaceflight.'
The International Space Station (ISS) is a $100 billion (£80 billion) science and engineering laboratory that orbits 250 miles (400 km) above Earth.
It has been permanently staffed by rotating crews of astronauts and cosmonauts since November 2000.
Crews have come mainly from the US and Russia, but the Japanese space agency JAXA and European space agency ESA have also sent astronauts.
The International Space Station has been continuously occupied for more than 20 years and has been expended with multiple new modules added and upgrades to systems
Research conducted aboard the ISS often requires one or more of the unusual conditions present in low Earth orbit, such as low-gravity or oxygen.
ISS studies have investigated human research, space medicine, life sciences, physical sciences, astronomy and meteorology.
The US space agency, NASA, spends about $3 billion (£2.4 billion) a year on the space station program, with the remaining funding coming from international partners, including Europe, Russia and Japan.
So far 244 individuals from 19 countries have visited the station, and among them eight private citizens who spent up to $50 million for their visit.
There is an ongoing debate about the future of the station beyond 2025, when it is thought some of the original structure will reach 'end of life'.
Russia, a major partner in the station, plans to launch its own orbital platform around then, with Axiom Space, a private firm, planning to send its own modules for purely commercial use to the station at the same time.
NASA, ESA, JAXA and the Canadian Space Agency (CSA) are working together to build a space station in orbit around the moon, and Russia and China are working on a similar project, that would also include a base on the surface.
LIVE: NASA's ISS change of command ceremony goes ahead early for medical evacuation
LONDEN - Mensen die zeggen dat ze zijn ontvoerd door ruimtewezens, geloven daar vaak zo sterk in dat ze lichamelijke klachten vertonen. Deze mensen geloven verder vaak in fantasieën, hebben een gestoord slaappatroon en zijn geïnteresseerd in spirituele zaken. De Amerikaanse universiteit Harvard heeft maandag deze resultaten van een onderzoek gepubliceerd.
Onderzoeker Richard McNally gelooft absoluut niet dat ruimtewezens mensen ontvoeren, maar zegt wel enkele lichamelijke oorzaken te hebben gevonden. Naar schatting vier miljoen Amerikanen menen dat zij ooit zijn ontvoerd door buitenaardse wezens.
De ondervraagde 'slachtoffers' hadden ongeveer dezelfde ervaring: ze lagen op een bed, omringd door apparaten, zagen flitslichten, hoorden geluiden en voelden prikkels. Velen zagen ook vreemde wezens rond het bed en meldden seksuele handelingen. Zeven van de tien mensen zeiden zeker te weten dat eicellen en zaadcellen waren weggenomen. Daarmee zouden de ruimtewezens mensen willen kweken. De aardlingen zijn daarna weer teruggebracht.
De onderzoekers hebben de mensen tijdens het praten over hun ervaringen lichamelijk onderzocht. Datzelfde is gedaan met een groep die ook onverwerkte traumatische ervaringen had, maar die te wijten waren aan zaken als oorlog en seksueel misbruik, en niet aan een buitenaardse ontvoering.
Hallucinaties
Beide groepen vertoonden grote overeenkomsten in stress-gerelateerde verschijnselen, zoals een verhoogde hartslag en transpiratie. Een Vietnam-veteraan vertoont dezelfde stress-symptomen als hij over de oorlog vertelt, als een persoon die zegt ontvoerd te zijn door een ruimtewezen, aldus McNally. De onderzoekers constateerden een aantal overeenkomende lichamelijke oorzaken, zoals slaapstoornissen. Volgens hen is er sprake van een soort hallucinaties ofwel 'dromen met je ogen open'.
De slaper ontwaakt bovendien te vroeg uit een fase waarin het lichaam door een soort ingebouwde verlamming niet kan bewegen. Dit verschijnsel voorkomt doorgaans dat mensen zichzelf tijdens heftige dromen verwonden. Ontwaak je te vroeg uit zo'n fase, dan kun je het gevoel hebben dat je niet kunt bewegen en dat kan beangstigend zijn.
Verder stelden de wetenschappers vast dat menig therapeut, bij wie iemand zich met onbestemde klachten meldt, zelf aangeeft dat het misschien wel om een UFO-ontvoering gaat. De patiënt neemt die reden dan opgelucht aan: er is een 'etiketje' voor de lichamelijke klachten.
An investigative journalist has claimed Australia is a 'hotbed' of UFOs after bizarre, unidentified objects were spotted hovering over military bases.
Former 60 Minutes Australia star Ross Coulthart told businessman and podcast host Mark Bouris that UFO sightings date back decades in Australia.
'I'm currently in touch with people from the RAAF Base Tindal in northern Australia, who tell me that there's been a spate of sightings of anomalous craft,' he said.
'These people are telling me that they're seeing UFOs. They're seeing anomalous objects. Nobody's been able to explain to them what they are.
'Everybody's in a complete flummox about it, but I suspect it's because the Americans have actually got nuclear weapons on Australian soil.'
Coulthart said sources inside Australia's military and intelligence community 'admit there are regularly breaches of the airspace over sensitive military facilities'.
'Recently, there was one over Richmond in Sydney. There was an object... I won't call it a drone, that sat there and hovered for over an hour and a half,' he said.
'It was recorded. It was reported to the relevant authorities, but they couldn't do anything to bring it down.
Investigative journalist Ross Coulthart (pictured) has claimed sources from an air force base in northern Australia have spotted anomalous aircraft
It comes just weeks after a group of workers have reported seeing an unidentified object in the sky near Fortescue Metals Group's Solomon mine site in Western Australia's Pilbara region
'We've allowed ourselves to become Fortress Australia for America, and we've got, I suspect, nuclear weapons on northern soil in Australia. Nobody's talking about this.
'A lot of these UFO sightings seem to cluster around nuclear and strategic assets, and that's not a coincidence.'
Coulthart said there was a history of UFO sightings in Australia that goes back decades, citing witness and former head of the Defence Department's Joint Intelligence Organisation Nuclear Branch Harry Turner.
Mr Turner saw intelligently controlled craft hovering over secretive British nuclear weapon tests in the South Australian desert at Maralinga during the 1950s and 1960s, according to the National Archives of Australia.
'As a senior scientist in the Defence Department, Turner actually pushed for Australia to set up its own UFO Flying Squad investigative team,' Coulthart said.
'He wanted a plane on standby so that we could scramble and go and investigate UFO incidents.
'There's a wonderful one where they had an outdoor cinema, and everybody at the outdoor cinema looked up and saw a craft - a structured, metallic craft - hovering overhead, with windows, silently cruising with no visible means of propulsion.
'These are reports that sit in our National Archives.'
A mystery object baffled residents in Alexander Heights, north of Perth, in 2019
Coulthart told businessman Mark Bouris (pictured) that Australia is a 'hotbed' for UFOs
The Department of Defence Defence does not have a protocol for reporting or recording of UAP or Unidentified Flying Objects (UFO).
The six workers were stunned when they saw the airborne object near Fortescue Metals Group's Solomon mine site in the Pilbara region at about 5am on December 7.
The group spotted the 'UFO' while driving from their laboratory worksite to catch a bus back to camp in the Hamersley Ranges.
Last year, a bizarre object was found on fire in remote WA with no visible signs to indicate how it got there.
Police coordinated a multi-agency response after the item was found in October close to a mining site near the small town of Newman.
The large black object was similar to other known space re-entry debris, WA Police said in a statement.
A month earlier, there were reports of strange lights in the sky near Point Moore in Geraldton, 420km north of Perth.
Perth Observatory received several reports of lights across a widespread area, which a spokesperson described as 'very confusing'.
At the time, the Department of Defence said there were no military training activities in the area on the night of the sightings.
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Over mijzelf
Ik ben Pieter, en gebruik soms ook wel de schuilnaam Peter2011.
Ik ben een man en woon in Linter (België) en mijn beroep is Ik ben op rust..
Ik ben geboren op 18/10/1950 en ben nu dus 75 jaar jong.
Mijn hobby's zijn: Ufologie en andere esoterische onderwerpen.
Op deze blog vind je onder artikels, werk van mezelf. Mijn dank gaat ook naar André, Ingrid, Oliver, Paul, Vincent, Georges Filer en MUFON voor de bijdragen voor de verschillende categorieën...
Veel leesplezier en geef je mening over deze blog.