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      Io: New image of a lake of fire, signs of permanent volcanism

      news.movim.eu / ArsTechnica · Yesterday - 18:17 · 1 minute

    Io: New image of a lake of fire, signs of permanent volcanism

    Enlarge (credit: NASA/JPL-Caltech/SwRI/MSSS/Gerald Eichstädt/Thomas Thomopoulos )

    Ever since the Voyager mission sent home images of Jupiter's moon Io spewing material into space, we've gradually built up a clearer picture of Io's volcanic activity. It slowly became clear that Io, which is a bit smaller than Mercury, is the most volcanically active body in the Solar System, with all that activity driven by the gravitational strain caused by Jupiter and its three other giant moons. There is so much volcanism that its surface has been completely remodeled, with no signs of impact craters.

    A few more details about its violence came to light this week, with new images being released of the moon's features, including an island in a lake of lava, taken by the Juno orbiter. At the same time, imaging done using an Earth-based telescope has provided some indications that this volcanism has been reshaping Io from almost the moment it formed.

    Fiery, glassy lakes

    The Juno orbiter's mission is primarily focused on studying Jupiter, including the dynamics of its storms and its internal composition. But many of its orbital passes have taken it right past Io, and this week, the Jet Propulsion Laboratory released some of the best images from these flybys. They include a shot of Loki Patera , a lake of lava that has an island within it. Also featured: the impossibly sheer slopes of Io's Steeple Mountain.

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      Daily Telescope: A stunning new image of Io reveals a volcanic plume

      news.movim.eu / ArsTechnica · Tuesday, 6 February - 13:00

    Behold: Io

    Enlarge / Behold: Io (credit: Björn Jónsson)

    Welcome to the Daily Telescope . There is a little too much darkness in this world and not enough light, a little too much pseudoscience and not enough science. We'll let other publications offer you a daily horoscope. At Ars Technica, we're going to take a different route, finding inspiration from very real images of a universe that is filled with stars and wonder.

    Good morning. It's February 6, and today's image reveals the Jovian moon Io in a revelatory new light.

    Over the weekend the operators of NASA's Juno spacecraft released a new batch of images showcasing a February 3 flyby of Io, the volcanically active moon orbiting Jupiter. Io, if you didn't know, is the most volcanically active world known to humans.

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      On avait jamais vu la lune volcanique de Jupiter avec une telle netteté

      news.movim.eu / Numerama · Wednesday, 3 January - 10:01

    La lune Io aux 400 volcans, satellite naturel de Jupiter, a été photographiée de près par la sonde Juno. On n'avait jamais vu sa surface avec une telle qualité d'image.

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      Juno makes its first ultra-close flyby of the volcano-covered moon Io

      news.movim.eu / ArsTechnica · Tuesday, 2 January - 14:02

    Juno flyby of Io on Dec. 30, 2023.

    Enlarge / Juno flyby of Io on Dec. 30, 2023. (credit: NASA)

    On Saturday NASA's Juno spacecraft, which has been orbiting Jupiter for the better part of a decade, made its closest flyby of the innermost moon in the Jovian system.

    The spacecraft came to within 930 miles (1,500 km) of the surface of Io, a dense moon that is the fourth largest in the Solar System. Unlike a lot of moons around Jupiter and Saturn, which have surface ice or subsurface water, Io is a very dry world. It is also extremely geologically active. Io has more than 400 active volcanoes and is therefore an object of great interest to astronomers and planetary scientists.

    Images from the December 30 flyby were posted by NASA over the New Year holiday weekend, and they provide some of the clearest views yet of this hell-hole world. The new data will help planetary scientists determine how often these volcanoes erupt and how this activity is connected to Jupiter's magnetosphere—Io is bathed in intense radiation from the gas-giant planet.

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      Jupiter’s moon Ganymede is telling us more about its alien ocean

      news.movim.eu / ArsTechnica · Tuesday, 14 November - 16:54

    Image of a moon with light and dark patches and many craters.

    Enlarge (credit: USGS )

    With Europa and Enceladus getting most of the attention for their subsurface oceans and potential to host life, other frozen worlds have been left in the shadows—but the mysterious Jovian moon Ganymede is now making headlines.

    While Ganymede hasn’t yet been observed spewing plumes of water vapor like Saturn’s moon Enceladus, Jupiter’s largest moon is most likely hiding an enormous saltwater ocean. Hubble observations suggest that the ocean—thought to sit under 150 km (95 miles) of ice—could be up to 100 km (60 miles) deep. That’s ten times deeper than the ocean on Earth.

    Ganymede is having a moment because NASA’s Juno mission observed salts and organic compounds on its surface, possibly from an ocean that lies beneath its crust of ice. While Juno’s observations can't provide decisive evidence that this moon has an ocean that makes Earth look like a kiddie pool, the Juno findings are the strongest evidence yet of salts and other chemicals making it to the exterior of Ganymede.

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      On a failli ne jamais voir ce superbe portrait d’une lune de Jupiter

      news.movim.eu / Numerama · Monday, 6 March, 2023 - 12:58

    La caméra de Juno a rencontré un dysfonctionnement récemment. Cette sonde de la Nasa survole régulièrement Jupiter et ses lunes. Heureusement, la caméra a bien fonctionné début mars 2023. [Lire la suite]

    Abonnez-vous aux newsletters Numerama pour recevoir l’essentiel de l’actualité https://www.numerama.com/newsletter/

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      NASA : Juno rapporte un gros plan exceptionnel de la lune gelée Europe

      news.movim.eu / JournalDuGeek · Saturday, 8 October, 2022 - 08:00

    juno1-158x105.jpg

    Cela faisait plus de 20 ans qu'Europe n'avait pas été observée de près.

    NASA : Juno rapporte un gros plan exceptionnel de la lune gelée Europe

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      Cette image de la lune glacée Europe est incroyablement détaillée

      news.movim.eu / Numerama · Thursday, 6 October, 2022 - 10:03

    Une nouvelle image, obtenue par Juno lors de son survol d'Europe, montre une partie de la lune de Jupiter de façon très détaillée. On y admire la croûte glacée de l'astre et ses surprenantes irrégularités. [Lire la suite]

    Abonnez-vous aux newsletters Numerama pour recevoir l’essentiel de l’actualité https://www.numerama.com/newsletter/

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      Cela faisait 20 ans qu’on n’avait pas eu de photo si proche d’Europe, la lune de Jupiter

      news.movim.eu / Numerama · Friday, 30 September, 2022 - 08:46

    Vingt ans après Galileo, Juno passe dans les parages d'Europe, une des lunes de Jupiter. L'occasion de la prendre de très près. Cela n'avait plus été [Lire la suite]

    Abonnez-vous aux newsletters Numerama pour recevoir l’essentiel de l’actualité https://www.numerama.com/newsletter/