{"id":9211,"date":"2018-07-19T09:32:13","date_gmt":"2018-07-19T09:32:13","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9211"},"modified":"2018-08-22T06:24:23","modified_gmt":"2018-08-22T06:24:23","slug":"titan-et-encelade-deux-satellites-bien-differents","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/07\/19\/titan-et-encelade-deux-satellites-bien-differents\/","title":{"rendered":"Titan et Encelade, deux satellites bien diff\u00e9rents"},"content":{"rendered":"

Retour sur l\u2019une des belles images de la banlieue de Saturne recueillies par la sonde Cassini, un clich\u00e9 des satellites Titan et Encelade.\u00a0<\/strong><\/p>\n

Le 15 septembre 2017, la sonde\u00a0Cassini<\/a>\u00a0effectuait un\u00a0grand plongeon<\/a>\u00a0dans les entrailles de Saturne, mettant fin \u00e0 plus d\u2019une d\u00e9cennie d\u2019exploration\u00a0de la plan\u00e8te gazeuse g\u00e9ante, de ses\u00a0anneaux\u00a0<\/a>et de ses principales lunes.\u00a0Arriv\u00e9e aux abords de Saturne en juin 2004, la sonde am\u00e9ricaine a r\u00e9alis\u00e9 une multitude d\u2019observations \u00e0 l\u2019aide de ses 12 instruments scientifiques et d\u2019incroyables photographies.<\/p>\n

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

Cassini \u00e9tait l\u2019une des plus grosses sondes interplan\u00e9taires jamais construites : elle mesurait pr\u00e8s de 7 m\u00e8tres de haut pour 4 m\u00e8tres de largeur et pesait 2.150 kg sans compter les 350 kg du module\u00a0Huygens\u00a0<\/a>(largu\u00e9 sur\u00a0Titan\u00a0<\/a>le 14 janvier 2005)\u00a0et plus de 3 tonnes d\u2019hydrazine pour la propulsion.<\/p>\n

R\u00e9alis\u00e9e en septembre 2011 par la sonde Cassini, cette image nous montre au premier plan Encelade (505 km de diam\u00e8tre), une petite lune de Saturne d\u00e9couverte par William Herschel<\/a> en 1789, qui intrigue beaucoup les scientifiques : on a d\u00e9couvert il y a des ann\u00e9es que sa cro\u00fbte glac\u00e9e laissait \u00e9chapper des geysers compos\u00e9s de vapeur d\u2019eau et de mati\u00e8re organique. Les plan\u00e9tologues sont arriv\u00e9s \u00e0 la conclusion que\u00a0le satellite Encelade abriterait bien un oc\u00e9an global<\/a>.<\/p>\n

Derri\u00e8re se trouve Titan, le plus grand satellite de\u00a0Saturne\u00a0avec un peu plus de 5.000 kilom\u00e8tres de diam\u00e8tre. Il a \u00e9t\u00e9 d\u00e9couvert par l\u2019astronome Christian Huygens en 1655 avec une simple petite lunette astronomique<\/a> de 57 mm de diam\u00e8tre. Titan poss\u00e8de des lacs d’hydrocarbures \u00e0 sa surface et l’atmosph\u00e8re qui entoure cette lune varie de 200 \u00e0 900 km d’\u00e9paisseur ; elle se compose principalement d\u2019azote mol\u00e9culaire (95 \u00e0 98%) et de m\u00e9thane.<\/p>\n","protected":false},"excerpt":{"rendered":"

Retour sur l\u2019une des belles images de la banlieue de Saturne recueillies par la sonde Cassini, un clich\u00e9 des satellites Titan et Encelade.\u00a0 Le 15 septembre 2017, la sonde\u00a0Cassini\u00a0effectuait un\u00a0grand plongeon\u00a0dans les entrailles de Saturne, mettant fin \u00e0 plus d\u2019une d\u00e9cennie d\u2019exploration\u00a0de la plan\u00e8te gazeuse g\u00e9ante, de ses\u00a0anneaux\u00a0et de ses principales lunes.\u00a0Arriv\u00e9e aux abords de … Continuer la lecture de Titan et Encelade, deux satellites bien diff\u00e9rents<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9209,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[646,570,136,567],"class_list":["post-9211","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-encelade","tag-mission-cassini-huygens","tag-saturne","tag-titan"],"yoast_head":"\nTitan et Encelade, deux satellites bien diff\u00e9rents<\/title>\n<meta name=\"description\" content=\"Retour sur l\u2019une des belles images de la banlieue de Saturne recueillies par la sonde Cassini, un clich\u00e9 des satellites Titan et Encelade.\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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