{"id":58756,"date":"2024-02-08T11:41:00","date_gmt":"2024-02-08T11:41:00","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne"},"modified":"2024-02-08T12:50:08","modified_gmt":"2024-02-08T12:50:08","slug":"un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne","title":{"rendered":"Un gigantesque oc\u00e9an cach\u00e9 sous la surface de Mimas, satellite de Saturne"},"content":{"rendered":"

Africa-Press – Tchad. <\/strong><\/span>Il ne devait sa relative notorie\u0301te\u0301 qu\u2019a\u0300 sa disgra\u0302ce: un e\u0301norme crate\u0300re de\u0301vorant sa surface fait ressembler Mimas a\u0300 l\u2019e\u0301toile noire de Star Wars. Hormis cela, difficile pour cet astre de 400 km de diame\u0300tre (8 fois moins que la Lune) de rivaliser avec les satellites \u00ab\u00a0stars\u00a0\u00bb du syste\u0300me solaire: Titan et son e\u0301paisse atmosphe\u0300re, Encelade et ses geysers projetant des particules de glace jusqu\u2019a\u0300 10.000 km d\u2019altitude, Europe (autour de Jupiter) la plus grande patinoire du syste\u0300me solaire… Mimas, presque entie\u0300rement compose\u0301 de glace d\u2019eau, est un vieux satellite comme en te\u0301moigne sa surface couverte de crate\u0300res. Sa petite taille laisse imaginer un astre fige\u0301, ste\u0301rile, ayant perdu depuis longtemps sa chaleur interne. Bref, un satellite sans grand inte\u0301re\u0302t en apparence, me\u0302me si depuis quelques anne\u0301es de\u0301ja\u0300, l’e\u0301tude de ses caracte\u0301ristiques orbitales avait mis la puce a\u0300 l’oreille des astronomes.<\/p>\n

Mais selon des travaux a\u0300 parai\u0302tre dans la revue Nature du 8 fe\u0301vrier 2024, il n’y a plus de doute: Mimas abriterait bien un oce\u0301an, 20 a\u0300 30 km sous sa surface. Ce re\u0301sultat a e\u0301te\u0301 pre\u0301sente\u0301 lors d\u2019une confe\u0301rence de presse a\u0300 l\u2019Observatoire de Paris par les astronomes Valery Lainey, Nicolas Rambaux et Kevin Baillie\u0301, trois des coauteurs de la publication. Mimas rejoindrait ainsi un club tre\u0300s ferme\u0301 compose\u0301 jusqu\u2019ici d’Europe, Ganyme\u0300de, Encelade et Titan. Plus surprenant encore, cet oce\u0301an serait tre\u0300s jeune a\u0300 l\u2019e\u0301chelle du syste\u0300me solaire, il aurait tout au plus 25 millions d’anne\u0301es.<\/p>\n

Mimas, entre ballon de foot et ballon de rugby<\/b><\/p>\n

Cette vocation aquatique tardive serait due a\u0300 plusieurs facteurs. D\u2019abord, Mimas aurait subi il y a environ 50 millions d\u2019anne\u0301es une perturbation de son orbite sous l\u2019effet gravitationnel de ses deux plus proches voisins, les satellites Encelade et Te\u0301thys. L’orbite se serait allonge\u0301e, passant ainsi de circulaire a\u0300 elliptique. Cette de\u0301formation a modifie\u0301 l\u2019action exerce\u0301e par Saturne sur le petit satellite. En exage\u0301rant un peu, Mimas s\u2019est mis a\u0300 passer de la forme d\u2019un ballon de foot, lorsqu\u2019il orbite au plus loin de la plane\u0300te, a\u0300 celle d\u2019un ballon de rugby lorsqu\u2019il orbite au plus pre\u0300s. Et cela a\u0300 chaque re\u0301volution !<\/p>\n

De quoi re\u0301chauffer brutalement son inte\u0301rieur par friction jusqu\u2019a\u0300 provoquer la fusion de la glace entourant son noyau, et engendrer un oce\u0301an. Le phe\u0301nome\u0300ne e\u0301tant re\u0301cent, cela expliquerait que la surface crate\u0301rise\u0301e de Mimas n\u2019ait pas encore e\u0301te\u0301 transforme\u0301e par l\u2019action de l\u2019oce\u0301an, contrairement a\u0300 Encelade et Europe qui semblent bien lisses en comparaison.<\/p>\n

La de\u0301funte sonde Cassini a\u0300 la rescousse<\/b><\/p>\n

Mais jusqu\u2019a\u0300 pre\u0301sent, cette hypothe\u0300se d\u2019un oce\u0301an interne e\u0301tait en concurrence avec une autre: un noyau simplement allonge\u0301, n\u2019ayant pas entrai\u0302ne\u0301 la fusion de la glace. Comment trancher entre les deux options, sans aller voir sur place ? C\u2019est l\u2019objet pre\u0301cise\u0301ment de cette nouvelle e\u0301tude. \u00ab\u00a0Nous avons de\u0301cide\u0301 d\u2019e\u0301tudier le mouvement orbital de Mimas, et notamment nous avons cherche\u0301 a\u0300 savoir en quelle mesure il pouvait trahir sa composition interne\u00a0\u00bb, explique Valery Lainey.<\/p>\n

Gra\u0302ce a\u0300 des mode\u0300les informatiques, les chercheurs ont de\u0301termine\u0301 que les deux hypothe\u0300ses n\u2019avaient en effet pas le me\u0302me impact sur la pre\u0301cession du plan orbital de Mimas. La pre\u0301cession correspond au mouvement de rotation de l\u2019ensemble de l\u2019orbite autour de la plane\u0300te (voir l’illustration ci-dessous).<\/p>\n

La pre\u0301cession du plan orbital de Mimas correspond au mouvement de l’orbite autour de la plane\u0300te, comme on le voit sur cette image en vert (Saturne est repre\u0301sente\u0301 sans ses anneaux). Cre\u0301dits: Observatoire de Paris<\/p>\n

Sa vitesse varie en fonction de la composition interne de Mimas. Un oce\u0301an se traduira par un mouvement rapide. Un noyau allonge\u0301 donnera un mouvement lent. La de\u0301termination de la pre\u0301cession de Mimas a demande\u0301 des calculs d\u2019une pre\u0301cision de quelques centaines de me\u0300tres sur l\u2019orbite. Pour cela, les scientifiques ont utilise\u0301 l\u2019e\u0301norme moisson de donne\u0301es re\u0301colte\u0301es par la sonde Cassini-Huygens, en orbite autour de Saturne de 2004 a\u0300 2017, et notamment toutes les images ou\u0300 le satellite apparait. En repe\u0301rant soigneusement le petit corps a\u0300 partir des e\u0301toiles qui l\u2019entourent, ils ont pu de\u0301terminer sa position au fil du temps et reconstituer son orbite durant la pe\u0301riode d\u2019activite\u0301 de la sonde.<\/p>\n

De l’e\u0301toile de la mort de Star Wars a\u0300 Genesis de Star Trek<\/b><\/p>\n

C\u2019est ainsi que l\u2019e\u0301quipe peut affirmer aujourd\u2019hui que la vitesse de pre\u0301cession du plan orbital de Mimas correspond bel et bien a\u0300 la pre\u0301sence d\u2019un oce\u0301an souterrain. \u00ab\u00a0L\u2019un des astres les plus anciens et en apparence ste\u0301rile du syste\u0300me solaire devient un objet propice a\u0300 la vie, s\u2019enthousiasme Valery Lainey. Autant dire que nous ne sommes plus du tout dans la logique de \u00ab\u00a0l\u2019e\u0301toile de la mort\u00a0\u00bb de Star Wars. Cela m\u2019e\u0301voque pluto\u0302t la plane\u0300te Genesis de la saga Star Trek, un astre froid, inhabitable, et qui d\u2019un claquement de doigt devient un objet accueillant pour la vie.\u00a0\u00bb<\/p>\n

Vue en coupe de Mimas avec son oce\u0301an interne situe\u0301 sous 20 a\u0300 30 km de glace. Cre\u0301dits: Fre\u0301de\u0301ric Durillon, Animea Studio, Observatoire de Paris \u2013 PSL, IMCCE<\/p>\n

Pour plus d’informations et d’analyses sur la Tchad<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Tchad. Il ne devait sa relative notorie\u0301te\u0301 qu\u2019a\u0300 sa disgra\u0302ce: un e\u0301norme crate\u0300re de\u0301vorant sa surface fait ressembler Mimas a\u0300 l\u2019e\u0301toile noire de Star Wars. Hormis cela, difficile pour cet astre de 400 km de diame\u0300tre (8 fois moins que la Lune) de rivaliser avec les satellites \u00ab\u00a0stars\u00a0\u00bb du syste\u0300me solaire: Titan et […]<\/p>\n","protected":false},"author":82,"featured_media":58755,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37,292,29],"class_list":["post-58756","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"yoast_head":"\nUn gigantesque oc\u00e9an cach\u00e9 sous la surface de Mimas, satellite de Saturne - tchad<\/title>\n<meta name=\"description\" content=\"Il ne devait sa relative notorie\u0301te\u0301 qu\u2019a\u0300 sa disgra\u0302ce: un e\u0301norme crate\u0300re de\u0301vorant sa surface fait ressembler Mimas ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un gigantesque oc\u00e9an cach\u00e9 sous la surface de Mimas, satellite de Saturne\" \/>\n<meta property=\"og:description\" content=\"Il ne devait sa relative notorie\u0301te\u0301 qu\u2019a\u0300 sa disgra\u0302ce: un e\u0301norme crate\u0300re de\u0301vorant sa surface fait ressembler Mimas ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne\" \/>\n<meta property=\"og:site_name\" content=\"tchad\" \/>\n<meta property=\"article:published_time\" content=\"2024-02-08T11:41:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-02-08T12:50:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2024\/02\/sm_1707383816.177723.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Un gigantesque oc\u00e9an cach\u00e9 sous la surface de Mimas, satellite de Saturne\",\"datePublished\":\"2024-02-08T11:41:00+00:00\",\"dateModified\":\"2024-02-08T12:50:08+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne\"},\"wordCount\":989,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2024\/02\/sm_1707383816.177723.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Tchad\",\"Tchad\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne\",\"url\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-gigantesque-ocean-cache-sous-la-surface-de-mimas-satellite-de-saturne\",\"name\":\"Un gigantesque oc\u00e9an cach\u00e9 sous la surface de Mimas, satellite de Saturne - 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