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Study Shows How Earthquake Monitors Can Track Space Junk Through Sonic Booms

A new study shows that earthquake monitoring networks can track falling space debris by detecting the sonic booms produced during atmospheric reentry, sometimes more accurately than radar. The Associated Press reports: Scientists reported Thursday that seismic readings from sonic booms that were generated when a discarded module from a Chinese crew capsule reentered over Southern California in 2024 allowed them to place the object's path nearly 20 miles (30 kilometers) farther south than radar had predicted from orbit. Using this method to track uncontrolled objects plummeting at supersonic speeds, they said, could help recovery teams reach any surviving pieces more quickly -- crucial if the debris is dangerous. "The problem at the moment is we can track stuff very well in space," said Johns Hopkins University's Benjamin Fernando, the lead researcher. "But once it gets to the point that it's actually breaking up in the atmosphere, it becomes very difficult to track." His team's findings, published in the journal Science, focus on just one debris event. But the researchers already have used publicly available data from seismic networks to track a few dozen other reentries, including debris from three failed SpaceX Starship test flights in Texas. [...] Fernando is looking to eventually publish a catalog of seismically tracked, entering space objects, while improving future calculations by factoring in the wind's effect on falling debris. In a companion article in Science, Los Alamos National Laboratory's Chris Carr, who was not involved in the study, said further research is needed to reduce the time between an object's final plunge and the determination of its course. For now, Carr said this new method "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."

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« Une très bonne expérience » : le paradoxe du retour d’urgence des astronautes de l’ISS

crew-11 retour équipage

Rentrés d'urgence de l’ISS pour raison médicale, les astronautes de Crew-11 voient dans cette première historique une preuve de la robustesse des procédures spatiales. Mais derrière ce satisfecit, l’incident rappelle surtout que le filet de sécurité de l’orbite basse n’existera plus une fois en route vers Mars.

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Date de lancement d’Artémis II : pourquoi le décollage du 6 février 2026 est incertain

NASA Artémis SLS

En théorie, le lancement de la mission Artémis II vers la Lune aura lieu le 6 février 2026 au plus tôt. Mais l'agence spatiale américaine (Nasa) rappelle qu'il y a tellement de paramètres à prendre en compte que le tir a des chances d'être décalé. Heureusement, il y a plusieurs autres créneaux de tir.

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Artémis II fera « juste » le tour de la Lune : pourquoi la Nasa n’autorise pas les astronautes à s’y poser

Pour la première fois depuis plus d'un demi-siècle, un équipage va se rendre à proximité de la Lune. Cependant, les astronautes à bord de la mission Artémis II ne se poseront pas pour autant sur notre satellite. La Nasa garde cette étape pour le prochain voyage avec Artémis III. Mais pourquoi attendre ?

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Endommagée, la capsule chinoise Shenzhou 20 a survécu à l’enfer du retour sur Terre

Une shenzhou 20 chine

Clap de fin pour la capsule fragilisée. Jugée inapte au vol habité après une collision avec un débris spatial, Shenzhou 20 a réussi son retour sur Terre à vide, ce lundi 19 janvier 2026. Une prouesse technique qui valide les réparations effectuées en orbite et referme trois mois de gestion de crise pour la Chine.

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Frappée par un débris spatial, la capsule chinoise Shenzhou 20 a survécu à l’enfer de la rentrée atmosphérique

Une shenzhou 20 chine

Clap de fin pour la capsule fragilisée. Jugée inapte au vol habité après une collision avec un débris spatial, Shenzhou 20 a réussi son retour sur Terre à vide, ce lundi 19 janvier 2026. Une prouesse technique qui valide les réparations effectuées en orbite et referme trois mois de gestion de crise pour la Chine.

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EHT Astronomers Will Film Swirling of a Supermassive Black Hole for the First Time

"Astronomers are preparing to capture a movie of a supermassive black hole in action for the first time," reports the Guardian: The Event Horizon Telescope (EHT) will track the colossal black hole at the heart of the Messier 87 galaxy throughout March and April with the aim of capturing footage of the swirling disc that traces out the edge of the event horizon, the point beyond which no light or matter can escape... The EHT is a global network of 12 radio telescopes spanning locations from Antarctica to Spain and Korea, which in 2019 unveiled the first image of a black hole's shadow. During March and April, as the Earth rotates, M87's central black hole will come into view for different telescopes, allowing a complete image to be captured every three days... Measuring the black hole's spin speed matters because this could help discriminate between competing theories of how these objects reached such epic proportions. If black holes grow mostly through accretion — steadily snowballing material that strays nearby — they would be expected to end up spinning at incredibly high speeds. By contrast, if black holes expand mostly through merging with other black holes, each merger could slow things down. The observations could also help explain how black hole jets are formed, which are among the largest, most powerful structures produced by galaxies. Jets channel vast columns of gas out of galaxies, slowing down the formation of new stars and limiting galaxy growth. In turn this can create dense pockets of material that trigger bursts of star formation beyond the host galaxy... While the movie campaign will take place in the spring, the sheer volume of data produced by the telescopes means the scientists will need to wait for Antarctic summer before the hard drives can be physically shipped to Germany and the US for processing. So it is likely to be a lengthy wait before the rest of the world gets a glimpse of the black hole in action. In a correction, the Guardian apologizes for originally including an AI-generated illustration of black hole with a caption suggesting it was a photo from telescopes. They've since swapped in an actual picture of the Messier 87 galaxy black hole.

Read more of this story at Slashdot.

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