{"id":5123,"date":"2016-03-02T14:51:07","date_gmt":"2016-03-02T14:51:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5123"},"modified":"2016-03-11T05:44:25","modified_gmt":"2016-03-11T05:44:25","slug":"partie-de-cache-cache-dans-la-banlieue-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/02\/partie-de-cache-cache-dans-la-banlieue-de-saturne\/","title":{"rendered":"Partie de cache-cache dans la banlieue de Saturne"},"content":{"rendered":"<p><strong>La sonde am\u00e9ricaine Cassini a photographi\u00e9 deux des satellites de Saturne, Encelade et Dion\u00e9, en train de jouer \u00e0 cache-cache.\u00a0<\/strong><\/p>\n<p>C&#8217;est une exploration qui dure depuis plus de 10 ans. Arriv\u00e9e aux abords de Saturne en juin 2004, la sonde am\u00e9ricaine <a href=\"http:\/\/photojournal.jpl.nasa.gov\/catalog\/PIA18345\" target=\"_blank\">Cassini <\/a>poursuit inlassablement ses observations scientifiques, nous envoyant r\u00e9guli\u00e8rement d&#8217;incroyables images de la plan\u00e8te, de ses <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/07\/03\/linclinaison-des-anneaux-de-saturne-de-2004-a-2015\/\" target=\"_blank\">anneaux <\/a>et de ses <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/09\/autour-de-saturne-des-anneaux-et-des-lunes\/\" target=\"_blank\">satellites<\/a>.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" frameborder=\"0\" width=\"480\" height=\"270\" src=\"\/\/www.dailymotion.com\/embed\/video\/x2h3se0\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: center\"><strong>En vid\u00e9o : un sous-marin sur Titan, dans les profondeurs du lac Kraken Mare<\/strong><\/p>\n<p>Lorsque l&#8217;image ci-dessous a \u00e9t\u00e9 r\u00e9alis\u00e9e le 8 septembre 2015, la sonde Cassini se trouvait alors \u00e0 83.000 km de <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/satellite-naturel-cassini-nous-offre-derniere-image-dione-59490\/\" target=\"_blank\">Dion\u00e9 <\/a>et \u00e0 364.000 km d&#8217;<a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/systeme-solaire-cassini-nouveau-plonge-panaches-encelade-60271\/\" target=\"_blank\">Encelade<\/a>. Bien que les deux satellites aient \u00e0 peu pr\u00e8s la m\u00eame composition, on constate qu&#8217;Encelade a une r\u00e9flectivit\u00e9 beaucoup plus \u00e9lev\u00e9e, sa surface \u00e9tant renouvel\u00e9e en permanence par une pluie de grains de glace venant de jets situ\u00e9s au p\u00f4le sud. Au contraire, sans apport de glace, la surface gel\u00e9e recouvrant Dion\u00e9 s&#8217;alt\u00e8re lentement et devient plus sombre.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/02\/dione_encelade.jpg\"  rel=\"lightbox[5123] attachment wp-att-5124\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5124\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/02\/dione_encelade-450x346.jpg\" alt=\"dione_encelade\" width=\"450\" height=\"346\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/02\/dione_encelade-450x346.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/02\/dione_encelade-768x591.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/02\/dione_encelade.jpg 1020w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Que sait-on sur ces deux satellites ?<!--more--><\/p>\n<p><strong>Encelade<\/strong> (505 km de diam\u00e8tre) intrigue beaucoup les scientifiques : de sa surface s&#8217;\u00e9chappent des\u00a0geysers compos\u00e9s de vapeur d\u2019eau m\u00eal\u00e9e \u00e0 de la mati\u00e8re organique et sal\u00e9e qui ont \u00e9t\u00e9 observ\u00e9s \u00e0 contre-jour depuis une d\u00e9cennie. Sous une banquise dont l&#8217;\u00e9paisseur devrait \u00eatre comprise entre 30 et 40 km se cache sans doute un immense <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/systeme-solaire-satellite-encelade-abriterait-bien-ocean-global-59894\/\" target=\"_blank\">oc\u00e9an<\/a>.<\/p>\n<p><strong>Dion\u00e9<\/strong> est un satellite de 1100 kilom\u00e8tres de diam\u00e8tre (principalement compos\u00e9 d\u2019eau sous forme de glace) dont la surface est tr\u00e8s crat\u00e9ris\u00e9e. Cette lune de Saturne comporte une fine atmosph\u00e8re dans laquelle\u00a0le spectrom\u00e8tre \u00e0 plasma Caps (pour <em><a href=\"http:\/\/saturn.jpl.nasa.gov\/spacecraft\/cassiniorbiterinstruments\/instrumentscassinicaps\/\" target=\"_blank\">CAssini Plasma Spectrometer<\/a><\/em>) a d\u00e9tect\u00e9 la pr\u00e9sence de mol\u00e9cules d\u2019oxyg\u00e8ne.\u00a0Des stries lumineuses (en r\u00e9alit\u00e9 de grandes failles aux parois brillantes) griffent par endroit la surface de Dion\u00e9. Observ\u00e9es pour la premi\u00e8re fois par les sondes Voyager dans les ann\u00e9es 1980, elles ne sont pas le r\u00e9sultat d\u2019un processus de cryovolcanisme comme on l&#8217;avait d&#8217;abord cru mais r\u00e9sulteraient d\u2019une activit\u00e9 tectonique.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>La sonde am\u00e9ricaine Cassini a photographi\u00e9 deux des satellites de Saturne, Encelade et Dion\u00e9, en train de jouer \u00e0 cache-cache.\u00a0 C&#8217;est une exploration qui dure depuis plus de 10 ans. Arriv\u00e9e aux abords de Saturne en juin 2004, la sonde am\u00e9ricaine Cassini poursuit inlassablement ses observations scientifiques, nous envoyant r\u00e9guli\u00e8rement d&#8217;incroyables images de la plan\u00e8te, &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/02\/partie-de-cache-cache-dans-la-banlieue-de-saturne\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Partie de cache-cache dans la banlieue de Saturne<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":5124,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1518,1124,646,39,486,754,575],"class_list":["post-5123","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-banquise","tag-dione","tag-encelade","tag-geyser","tag-nasa","tag-sonde-cassini","tag-spectrometre"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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