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the latest on Science 🇬🇧 les dernières nouvelles en Sciences 🇫🇷 🆘 @skyfleet.blue

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Sciences
@sciences.skyfleet.blue

A Deep-Mantle Garnet Might Hold the Secret to Ancient Martian Magma

universetoday.comA Deep-Mantle Garnet Might Hold the Secret to Ancient Martian MagmaA history of a planet’s volcanic activity is contained in its rocks. And Mars’ rocks - or at least many of the meteorites that have made the journey from it to Earth - were telling a contradictory story. They appeared to be highly oxidized, but our understanding of the internal volcanic forces on Mars meant that they should have been formed in a reducing environment - the exact opposite of what the chemical makeup of the rocks themselves indicate. Now, a new paper published in the Journal of Geophysical Research: Solid Earth from planetary scientists Hideharu Kuwahara and Ryoichi Nakada of Ehime University provides an answer as to why - and it involves a gemstone.
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Des supraconducteurs aux bulles de savon, la matière condensée fait le point à Toulouse

pourlascience.frDes supraconducteurs aux bulles de savon, la matière condensée fait le point à ToulousePendant une semaine, du 26 au 30 octobre, 800 scientifiques présentent leurs travaux de recherche lors d’une grande conférence à l’université Paul-Sabatier, à Toulouse. Un instantané de la recherche française dans un domaine qui s’étend des matériaux de l’électronique aux mousses et aux tissus vivants.
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Des organoïdes cérébraux cultivés pendant cinq ans reproduisent le développement du cerveau humain

pourlascience.frDes organoïdes cérébraux cultivés pendant cinq ans reproduisent le développement du cerveau humainDes chercheurs ont maintenu actifs pendant cinq ans des modèles qui reproduisent certaines structures du cerveau humains. Leur maturation reproduit plusieurs étapes du développement du cerveau, du stade fœtal aux premières années après la naissance.
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APOD: 2026 October 27 – Noctilucent Clouds over Sweden

science.nasa.govAPOD: 2026 October 27 - Noctilucent Clouds over Sweden - NASA ScienceAPOD Science APOD APOD: 2026 October 27 –… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss   APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Noctilucent Clouds over Sweden Explanation:  Sometimes it’s night on the ground but day in the air. As the Earth rotates to eclipse the Sun,  sunset rises up from the ground. Therefore, at sunset on the ground, sunlight still shines on  clouds  above. Under  usual circumstances , a pretty sunset might be visible, but unusual  noctilucent clouds  float so high up they can be seen well after dark. Normally too dim to be seen,  they  may become visible just after sunset during the summer when illuminated by sunlight from below the horizon.  Noctilucent cloud s are the highest clouds and are known more technically as  polar mesospheric clouds . Featured here as they appeared in early August, a network of blue noctilucent clouds was captured in the distant sky above a field of green grass near  Linköping ,  Sweden , with trees in  stark silhouette  across the horizon. Much about  noctilucent clouds  has been  discovered  only in the past two decades, while  how they form and evolve  remains a topic of  active research . Tomorrow’s picture:  round and round Date October 27, 2026 Credit & Copyright V. Höfer , D. Večerník & B. Večerníková Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe A service of: ASD at NASA / GSFC , NASA Science Activation & Michigan Tech. U. Random APOD Generator Yesterday’s Image APOD: 2026 October 26 – M42: The Great Nebula in Orion Tomorrow’s Image
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Asymmetric space waves map pressure on Earth's magnetic shield

universetoday.comAsymmetric space waves map pressure on Earth's magnetic shieldThe Earth’s magnetic field is responsible for shielding us from harmful space weather, including solar radiation from the Sun but also cosmic rays originating from outside our solar system. Cosmic rays can include deep space supernovas, so the magnetic field takes the majority of the brunt from solar radiation. Without our magnetic field, the solar wind would slowly strip away our atmosphere, making life on our small, blue world impossible to exist. But where is the magnetic field doing the heaviest lifting regarding how it filters out incoming space radiation?
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Scientists Can Now Spot Hidden Sunspots on the Solar Far Side

universetoday.comScientists Can Now Spot Hidden Sunspots on the Solar Far SideUnlike the Moon, the Sun is constantly rotating from our perspective - but we still only see half of it at any given time. Since it takes 27 days to complete a full rotation, that leaves plenty of time for changes to happen to the side we can’t see that could directly impact Earth’s own space weather a few weeks later. Now a team of physicists led by Bibhuti Kumar Jha of the Southwest Research Institute has published a paper in The Astrophysical Journal Supplement Series that uses probability to map out what might be happening on the far side of the Sun, even if we can’t see it directly.
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Parker Solar Probe Spots Twisted Magnetic Braids Growing in the Solar Wind

universetoday.comParker Solar Probe Spots Twisted Magnetic Braids Growing in the Solar WindThe magnetic environment around the Sun is a jumbled mess of chaotic fields and streams of charged particles. Recently we’ve been getting at least slightly better at mapping out its complexity, thanks in large part to data collected by missions like the Parker Solar Probe and Solar Orbiter. But there’s still a large grey area surrounding the interface between the large scale hydrodynamic properties of plasmas and the microscopic properties of individual ions, and scientists believe understanding large scale features of the Sun, such as why its corona is so much hotter than its surface, may rely on our knowledge of that interface. A new paper that directly tackles some of the outstanding questions about that interface was recently published in The Astrophysical Journal Letters by Masatomi Iizawa of the Technical University of Braunschweig and his co-authors.
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Astéroïde Bennu : ce que les échantillons révèlent sur les origines du Système solaire

pourlascience.frAstéroïde Bennu : ce que les échantillons révèlent sur les origines du Système solaireLa sonde spatiale Osiris-Rex, de la Nasa, a rapporté sur Terre des échantillons de l’astéroïde Bennu. Leur analyse apporte de précieuses informations sur la formation du Système solaire, sur la chimie prébiotique et même sur nos stratégies de défense planétaire.
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2026 October 26 – M42: The Great Nebula in Orion

science.nasa.gov2026 October 26 - M42: The Great Nebula in Orion - NASA ScienceAPOD Science APOD 2026 October 26 – M42: The… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss   APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. M42: The Great Nebula in Orion Explanation: The Great Nebula in Orion , an immense, nearby starbirth region , is one the most famous of all astronomical nebulas . Here, glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud only 1500 light-years away. In the featured deep image in assigned colors highlighted by emission in hydrogen , wisps and sheets of dust and gas are particularly evident. The Great Nebula in Orion can be found with the unaided eye near the easily identifiable belt of three stars in the popular constellation Orion . In addition to housing a bright open cluster of stars known as the Trapezium , the Orion Nebula contains many stellar nurseries . These nurseries contain much hydrogen gas, hot young stars, proplyds , and stellar jets spewing material at high speeds. Also known as M42 , the Orion Nebula spans about 40 light years and is located in the same spiral arm of our Galaxy as the Sun . Tomorrow’s picture: open space Date: October 26, 2026 Credit & Copyright: Roberto Palaia Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe A service of: ASD at NASA / GSFC , NASA Science Activation & Michigan Tech. U. Random APOD Generator Yesterday’s Image APOD: 2026 October 25 – Dark Matter in a Simulated Universe Tomorrow’s Image
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APOD: 2026 October 25 – Dark Matter in a Simulated Universe

science.nasa.govAPOD: 2026 October 25 - Dark Matter in a Simulated Universe - NASA ScienceAPOD Science APOD APOD: 2026 October 25 – Dark… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss   APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Dark Matter in a Simulated Universe Explanation: Is our universe haunted? It might look that way on this dark matter map. The gravity of unseen dark matter is the leading explanation for why galaxies rotate so fast , why galaxies orbit clusters so fast , why gravitational lenses so strongly deflect light, and how visible matter is distributed. The featured image from the American Museum of Natural History ‘s Hayden Planetarium Space Show, Dark Universe, highlights one example of how pervasive dark matter might haunt our universe. In this frame from a detailed computer simulation , complex filaments of dark matter, shown in black, are strewn about the universe like spider webs , while the relatively rare clumps of familiar baryon ic matter are colored orange. These simulations are good statistical matches to astronomical observations. In what is perhaps a scarier turn of events, dark matter — although quite strange and in an unknown form — is no longer thought to be the strangest source of gravity in the universe . That honor now falls to dark energy , a more uniform source of repulsive gravity that seems to now dominate the expansion of the entire universe . Tomorrow’s picture: Orion the Great Date: October 25, 2026 Credit & Copyright: Tom Abel & Ralf Kaehler ( KIPAC , SLAC ), AMNH Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe A service of: ASD at NASA / GSFC , NASA Science Activation & Michigan Tech. U. Random APOD Generator Yesterday’s Image APOD: 2026 October 24 – Rosetta’s Selfie Tomorrow’s Image
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Du Big Bang à aujourd’hui : l’histoire de l’Univers en sept grandes étapes

pourlascience.frDu Big Bang à aujourd’hui : l’histoire de l’Univers en sept grandes étapesInflation, premières particules, naissance des étoiles, matière noire, expansion accélérée… Le physiciens théoricien Yann Mambrini retrace les grandes phases de l’histoire de l’Univers et explore les scénarios possibles pour son avenir dans son nouveau livre « Il était sept fois l’Univers » (Albin Michel).
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APOD: 2026 October 24 – Rosetta’s Selfie

science.nasa.govAPOD: 2026 October 24 – Rosetta's Selfie - NASA ScienceAPOD Science APOD APOD: 2026 October 24 –… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss   APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Rosetta’s Selfie Explanation: This Rosetta spacecraft selfie was snapped on October 7th, 2014. At the time the comet-chasing spacecraft was about 472 million kilometers from planet Earth, but only 16 kilometers from the surface of comet 67P/Churyumov-Gerasimenko . Looming beyond the spacecraft near the top of the frame, dust and gas stream away from the comet’s curious double-lobed nucleus . Bright sunlight glints off one of Rosetta’s 14 meter long solar arrays. In fact, two exposures, one short and one long, were combined to record the dramatic high contrast scene using the CIVA camera system on Rosetta’s still-attached Philae lander . Its chosen primary landing site was on the visible hemisphere of the smaller lobe of the nucleus. This was the last image from Philae’s camera before the lander separated from Rosetta on November 12. Shortly after separation Philae took another image looking back toward the orbiter and began its descent to the nucleus of the comet. Tomorrow’s picture: dark matters Date October 24, 2026 Credit: ESA/Rosetta/Philae/CIV A Authors & editors: Jerry Bonnell, Cecilia Chirenti, Robert Nemiroff, Keighley Rockcliffe A service of: ASD at NASA / GSFC , NASA Science Activation & Michigan Tech. U. Random APOD Generator Yesterday’s Image APOD: 2026 October 23 – Andromeda in Southern Spring Tomorrow’s Image