{"id":9136,"date":"2018-05-03T08:36:02","date_gmt":"2018-05-03T08:36:02","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9136"},"modified":"2018-05-13T16:47:45","modified_gmt":"2018-05-13T16:47:45","slug":"satellite-europe-projette-ombre-jupiter","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/05\/03\/satellite-europe-projette-ombre-jupiter\/","title":{"rendered":"Quand le satellite Europe projette son ombre sur Jupiter"},"content":{"rendered":"

Cette incroyable image montre l’ombre d’Europe, l’un des satellites de Jupiter, en train de se projeter sur la Grande tache rouge.\u00a0<\/strong><\/p>\n

L’image est ancienne et pourtant elle fait toujours r\u00eaver ; prise par la sonde am\u00e9ricaine Galileo<\/a> le 22 mai 2000, elle montre l’ombre d’une des lunes de Jupiter<\/a> (Europe) qui se projette sur la Grande tache rouge, un gigantesque anticyclone d’environ 15.000 km de long que l’on peut observer depuis sa d\u00e9couverte par l’astronome Jean-Dominique Cassini en 1665.<\/p>\n

\"\"<\/a><\/p>\n

Cette tache situ\u00e9e \u00e0 22\u00b0 sud de latitude dans laquelle le vent circule \u00e0 pr\u00e8s de 700 km\/h est un peu plus grande que la Terre mais elle a beaucoup r\u00e9tr\u00e9ci depuis 350 ans qu’on l’\u00e9tudie.<\/p>\n

Visible depuis la Terre avec un petit t\u00e9lescope<\/a> d’une dizaine de cm de diam\u00e8tre, la Grande tache rouge a \u00e9t\u00e9 survol\u00e9e pour la premi\u00e8re fois par une sonde spatiale (Voyager 1) le 25 f\u00e9vrier 1979.<\/p>\n

Comme Io, Ganym\u00e8de et\u00a0Callisto<\/a>, Europe est l\u2019un des 4 satellites de\u00a0Jupiter\u00a0d\u00e9couverts par le savant italien Galil\u00e9e<\/a> en 1610 \u00e0 l\u2019aide de sa\u00a0lunette astronomique<\/a>.\u00a0Second\u00a0satellite en partant de la plan\u00e8te g\u00e9ante, il est recouvert d\u2019une couche de glace parcourue de longues fractures, sous laquelle se trouve sans doute un oc\u00e9an.<\/p>\n

Surnomm\u00e9e “la Rolls de l’Espace” en raison de son co\u00fbt astronomique (1,39 milliard de dollars), la sonde Galileo a \u00e9t\u00e9 lanc\u00e9e le 18 octobre 1989 par la navette spatiale am\u00e9ricaine Atlantis. Apr\u00e8s un voyage de 6 ans elle s’est plac\u00e9e en orbite autour de Jupiter le 7 d\u00e9cembre 1995 pour l’\u00e9tudier avant de plonger dans ses nuages gazeux au mois de septembre 2003. La mission comprenait un orbiteur et une sonde atmosph\u00e9rique largu\u00e9e dans l’atmosph\u00e8re de Jupiter. Les deux engins qui emportaient 22 instruments scientifiques ont accumul\u00e9\u00a0une impressionnante moisson de renseignements scientifiques et de d\u00e9couvertes deux d\u00e9cennies apr\u00e8s le passage des sondes Voyager.<\/p>\n","protected":false},"excerpt":{"rendered":"

Cette incroyable image montre l’ombre d’Europe, l’un des satellites de Jupiter, en train de se projeter sur la Grande tache rouge.\u00a0 L’image est ancienne et pourtant elle fait toujours r\u00eaver ; prise par la sonde am\u00e9ricaine Galileo le 22 mai 2000, elle montre l’ombre d’une des lunes de Jupiter (Europe) qui se projette sur la … Continuer la lecture de Quand le satellite Europe projette son ombre sur Jupiter<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9137,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[412,158,1442,621,90,1930,543],"class_list":["post-9136","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-europe","tag-galilee","tag-grande-tache-rouge","tag-jean-dominique-cassini","tag-jupiter","tag-sonde-galileo","tag-sonde-voyager"],"yoast_head":"\nQuand le satellite Europe projette son ombre sur Jupiter<\/title>\n<meta name=\"description\" content=\"Cette incroyable image montre l'ombre d'Europe, l'un des satellites de Jupiter, en train de se projeter sur la Grande tache rouge.\u00a0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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