{"id":11252,"date":"2021-10-16T21:51:23","date_gmt":"2021-10-16T21:51:23","guid":{"rendered":"https:\/\/www.africa-press.net\/cameroun\/politique\/hubble-apporte-des-preuves-de-vapeur-deau-persistante-dans-un-hemisphere-deurope"},"modified":"2021-10-16T21:52:46","modified_gmt":"2021-10-16T21:52:46","slug":"hubble-apporte-des-preuves-de-vapeur-deau-persistante-dans-un-hemisphere-deurope","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cameroun\/toutes-les-actualites\/hubble-apporte-des-preuves-de-vapeur-deau-persistante-dans-un-hemisphere-deurope","title":{"rendered":"Hubble apporte des preuves de vapeur d’eau persistante dans un h\u00e9misph\u00e8re d’Europe"},"content":{"rendered":"

Africa-Press<\/a> – Cameroun<\/a>. <\/strong><\/span>De la vapeur d’eau a \u00e9t\u00e9 trouv\u00e9e, de fa\u00e7on persistante, sur l’h\u00e9misph\u00e8re arri\u00e8re d’Europe, la lune de Jupiter. \u00c9tonnamment, son h\u00e9misph\u00e8re avant en semble d\u00e9pourvu.<\/b><\/p>\n

Europe, le quatri\u00e8me plus grand satellite de Jupiter, int\u00e9resse grandement les astronomes. Le plus petit des satellites galil\u00e9ens semble en effet abriter un oc\u00e9an d’eau sous la surface, ce qui en fait un objet d’\u00e9tude des plus importants pour la recherche d’une \u00e9ventuelle forme de vie extraterrestre.<\/p>\n

Comme nous vous le rapportions dans les articles ci-dessous, des panaches de vapeur d’eau, similaires \u00e0 ceux observ\u00e9s sur Encelade, semblent s’\u00e9chapper d’Europe, probablement caus\u00e9s par des cryogeysers en \u00e9ruption.<\/p>\n

De la vapeur d’eau, mais sur un seul h\u00e9misph\u00e8re<\/b><\/p>\n

Le satellite Europe est ainsi connu pour \u00eatre entour\u00e9 d’une fine atmosph\u00e8re de dioxyg\u00e8ne et de vapeur d’eau, m\u00eame si la pression \u00e0 sa surface n’est qu’un milliardi\u00e8me de la pression \u00e0 la surface de la Terre.<\/p>\n

Des observations des lunes glac\u00e9es de Jupiter dans l’ultraviolet lointain, obtenues gr\u00e2ce au t\u00e9lescope spatial Hubble, ont \u00e9t\u00e9 utilis\u00e9es dans le pass\u00e9 pour d\u00e9tecter leurs atmosph\u00e8res d’oxyg\u00e8ne. La r\u00e9analyse d’images et de spectres de Ganym\u00e8de, le plus gros satellite naturel de Jupiter et de tout le Syst\u00e8me solaire, a r\u00e9cemment montr\u00e9 que les m\u00eames observations contiennent \u00e9galement des informations selon lesquelles la vapeur d’eau est abondante dans son atmosph\u00e8re en plus de l’oxyg\u00e8ne. En utilisant la m\u00eame analyse pour Europe, Lorenz Roth, de l’\u00c9cole royale polytechnique (KTH) \u00e0 Stockholm (Su\u00e8de), y a trouv\u00e9 \u00e9galement une atmosph\u00e8re de vapeur d’eau, mais uniquement au-dessus de l’h\u00e9misph\u00e8re arri\u00e8re de la lune (l’h\u00e9misph\u00e8re qui est dos \u00e0 son mouvement orbital).<\/p>\n

La vapeur d’eau n’a pas \u00e9t\u00e9 vue directement, mais plut\u00f4t l’empreinte spectrale ultraviolette de l’oxyg\u00e8ne a \u00e9t\u00e9 mesur\u00e9e par Hubble. Comme l’explique Lorenz Roth dans son article, des \u00e9tudes ant\u00e9rieures de l’intensit\u00e9 des \u00e9missions de l’oxyg\u00e8ne \u00e0 135,6 et 130,4 nanom\u00e8tres ont r\u00e9v\u00e9l\u00e9 du dioxyg\u00e8ne dans l’atmosph\u00e8re d’Europe. Ici, il a \u00e9tudi\u00e9 les changements relatifs des deux \u00e9missions d’oxyg\u00e8ne et le profil radial des \u00e9missions \u00e0 travers le disque ensoleill\u00e9 dans des observations du t\u00e9lescope spatial Hubble prises en 1999, 2012, 2014 et 2015, alors que la lune \u00e9tait \u00e0 diff\u00e9rentes positions orbitales.<\/p>\n

Les observations impliquent une abondance de vapeur d’eau stable dans la partie centrale de l’h\u00e9misph\u00e8re arri\u00e8re \u00e9clair\u00e9 par le Soleil, avec un rapport H2O\/O2 de 12 \u00e0 22. Cela signifie que la vapeur d’eau est constamment reconstitu\u00e9e dans cet h\u00e9misph\u00e8re. En revanche, sur l’h\u00e9misph\u00e8re avant, les \u00e9missions sont compatibles avec une atmosph\u00e8re de dioxyg\u00e8ne pur.<\/p>\n

Un sujet d’\u00e9tude prometteur pour les missions \u00e0 venir<\/b><\/p>\n

Contrairement aux geysers, cette vapeur d’eau ne vient pas de l’int\u00e9rieur d’Europe, mais plut\u00f4t de la sublimation de la glace de surface par la lumi\u00e8re solaire.<\/p>\n

Cette d\u00e9tection ouvre la voie \u00e0 des \u00e9tudes approfondies d’Europe lors de futures missions spatiales, dont Jupiter Icy Moons Explorer (Juice), sonde de l’Agence spatiale europ\u00e9enne dont le lancement est pr\u00e9vu en ao\u00fbt ou septembre 2022, et sa cons\u0153ur am\u00e9ricaine Europa Clipper, qui devrait pour sa part d\u00e9coller en octobre 2024. Comprendre la formation et l’\u00e9volution de Jupiter et de ses lunes aide \u00e9galement les astronomes \u00e0 mieux comprendre les plan\u00e8tes semblables \u00e0 Jupiter autour d’autres \u00e9toiles.<\/p>\n

Nouveaux indices que de l’eau jaillit de la surface d’Europe, lune de Jupiter<\/p>\n

La surface glac\u00e9e d’Europe, l’une des principales lunes de Jupiter, est \u00e9paisse de plusieurs kilom\u00e8tres. En dessous, un oc\u00e9an d’eau. Depuis longtemps, les chercheurs soup\u00e7onnent que des panaches d’eau puissent s’en \u00e9chapper. Sans pouvoir solidement le d\u00e9montrer. Mais de nouveaux indices viennent d’\u00eatre d\u00e9couverts dans d’anciennes donn\u00e9es de la sonde Galileo.<\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Cameroun. De la vapeur d’eau a \u00e9t\u00e9 trouv\u00e9e, de fa\u00e7on persistante, sur l’h\u00e9misph\u00e8re arri\u00e8re d’Europe, la lune de Jupiter. \u00c9tonnamment, son h\u00e9misph\u00e8re avant en semble d\u00e9pourvu. Europe, le quatri\u00e8me plus grand satellite de Jupiter, int\u00e9resse grandement les astronomes. Le plus petit des satellites galil\u00e9ens semble en effet abriter un oc\u00e9an d’eau sous la […]<\/p>\n","protected":false},"author":82,"featured_media":11251,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[36,50,49,247,73],"class_list":["post-11252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-cameroun","tag-cameroun","tag-europe","tag-hubble"],"yoast_head":"\nHubble apporte des preuves de vapeur d'eau persistante dans un h\u00e9misph\u00e8re d'Europe - Cameroun<\/title>\n<meta name=\"description\" content=\"De la vapeur d'eau a \u00e9t\u00e9 trouv\u00e9e, de fa\u00e7on persistante, sur l'h\u00e9misph\u00e8re arri\u00e8re d'Europe, la lune de Jupiter. \u00c9tonna ...\" \/>\n<meta name=\"robots\" content=\"index, follow, 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