{"id":3346,"date":"2015-08-10T08:17:57","date_gmt":"2015-08-10T08:17:57","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3346"},"modified":"2015-08-23T06:28:37","modified_gmt":"2015-08-23T06:28:37","slug":"de-mysterieuses-lignes-rouges-sur-le-satellite-tethys","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/","title":{"rendered":"De myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys"},"content":{"rendered":"

La sonde Cassini a photographi\u00e9 d’\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l’une des lunes glac\u00e9es de la plan\u00e8te Saturne.<\/strong><\/p>\n

M\u00eame si Saturne <\/a>est une plan\u00e8te d\u00e9licate \u00e0 observer (elle est actuellement assez basse sur l’horizon sud dans la constellation de la Balance), la mission Cassini <\/a>nous permet d’admirer en haute r\u00e9solution la plan\u00e8te aux anneaux et ses satellites, dont T\u00e9thys, un corps glac\u00e9 d’un peu plus de 1000 km de diam\u00e8tre d\u00e9couvert en 1684 par l’astronome Jean-Dominique Cassini.<\/p>\n

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

La sonde am\u00e9ricaine a survol\u00e9 T\u00e9thys en avril 2015 \u00e0 une distance de 53 000 km, r\u00e9alisant de nouvelles images \u00e0 travers diff\u00e9rents filtres destin\u00e9s \u00e0 mettre en \u00e9vidence de subtiles diff\u00e9rences de couleurs.<\/p>\n

Ces images r\u00e9v\u00e8lent l’existence d’\u00e9troites lignes courbes rouges \u00e0 la surface de l’h\u00e9misph\u00e8re nord de T\u00e9thys, une caract\u00e9ristique insolite jusqu’alors inobserv\u00e9e sur les satellites de Saturne<\/a>. Paul Schenk (Lunar and Planetary Institute<\/a><\/em>) a d\u00e9clar\u00e9\u00a0: “ces arcs rouges nous ont vraiment saut\u00e9 aux yeux quand nous avons vu les nouvelles images. Leur ampleur est tout \u00e0 fait surprenante”<\/em>.<\/p>\n

L’origine et la couleur de ces arcs rouge\u00e2tres est encore un myst\u00e8re pour les scientifiques de l’\u00e9quipe Cassini. Ces derniers ont sugg\u00e9r\u00e9 diff\u00e9rentes hypoth\u00e8ses : glace teint\u00e9e par des impuret\u00e9s chimiques, restes d’un d\u00e9gazage venu de l’int\u00e9rieur de T\u00e9thys ou zones de fractures qui sont en dessous de la r\u00e9solution des images disponibles\u00a0? Sauf pour quelques petits crat\u00e8res sur Dion\u00e9<\/a>, la couleur rouge\u00e2tre se rencontre rarement sur les lunes de Saturne. On en trouve par contre beaucoup plus sur Europe<\/a>, l’un des satellites de Jupiter<\/a>.<\/p>\n

Pour Paul Helfenstein (Cornell University<\/a><\/em>), “les arcs rouges observ\u00e9s sur T\u00e9thys doivent \u00eatre g\u00e9ologiquement jeunes puisqu’ils recouvrent des crat\u00e8res d’impact, mais nous ne savons pas estimer cet \u00e2ge. Si ces taches sont un simple d\u00e9p\u00f4t de couleur sur le sol glac\u00e9, l’exposition \u00e0 l’environnement spatial pourrait les effacer sur des \u00e9chelles de temps relativement courtes”<\/em>.<\/p>\n

L’\u00e9quipe Cassini a planifi\u00e9 un nouveau survol de T\u00e9thys avant la fin de l’ann\u00e9e 2015 pour tenter de r\u00e9soudre cette \u00e9nigme.<\/p>\n","protected":false},"excerpt":{"rendered":"

La sonde Cassini a photographi\u00e9 d’\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l’une des lunes glac\u00e9es de la plan\u00e8te Saturne. M\u00eame si Saturne est une plan\u00e8te d\u00e9licate \u00e0 observer (elle est actuellement assez basse sur l’horizon sud dans la constellation de la Balance), la mission Cassini nous permet d’admirer en haute r\u00e9solution … Continuer la lecture de De myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3347,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1124,412,621,90,136,754,624],"class_list":["post-3346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-dione","tag-europe","tag-jean-dominique-cassini","tag-jupiter","tag-saturne","tag-sonde-cassini","tag-tethys"],"yoast_head":"\nDe myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys<\/title>\n<meta name=\"description\" content=\"La sonde Cassini a photographi\u00e9 d'\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l'une des lunes glac\u00e9es de la plan\u00e8te Saturne.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"De myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys\" \/>\n<meta property=\"og:description\" content=\"La sonde Cassini a photographi\u00e9 d'\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l'une des lunes glac\u00e9es de la plan\u00e8te Saturne.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2015-08-10T08:17:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-08-23T06:28:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1264\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jean-Baptiste FELDMANN\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jean-Baptiste FELDMANN\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/\",\"name\":\"De myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg\",\"datePublished\":\"2015-08-10T08:17:57+00:00\",\"dateModified\":\"2015-08-23T06:28:37+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\"},\"description\":\"La sonde Cassini a photographi\u00e9 d'\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l'une des lunes glac\u00e9es de la plan\u00e8te Saturne.\",\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg\",\"width\":1264,\"height\":900,\"caption\":\"De myst\u00e9rieuses lignes rouges sur T\u00e9thys\"},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/\",\"name\":\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\",\"description\":\""J'ai en moi un besoin terrible. Dirais-je le mot? La religion. Alors, je sors la nuit et je peins des \u00e9toiles." Vincent van Gogh\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\",\"name\":\"Jean-Baptiste FELDMANN\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g\",\"caption\":\"Jean-Baptiste FELDMANN\"},\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/author\/jbfe\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"De myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys","description":"La sonde Cassini a photographi\u00e9 d'\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l'une des lunes glac\u00e9es de la plan\u00e8te Saturne.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/","og_locale":"fr_FR","og_type":"article","og_title":"De myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys","og_description":"La sonde Cassini a photographi\u00e9 d'\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l'une des lunes glac\u00e9es de la plan\u00e8te Saturne.","og_url":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/","og_site_name":"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel","article_published_time":"2015-08-10T08:17:57+00:00","article_modified_time":"2015-08-23T06:28:37+00:00","og_image":[{"width":1264,"height":900,"url":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg","type":"image\/jpeg"}],"author":"Jean-Baptiste FELDMANN","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"Jean-Baptiste FELDMANN","Dur\u00e9e de lecture estim\u00e9e":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/","url":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/","name":"De myst\u00e9rieuses lignes rouges sur le satellite T\u00e9thys","isPartOf":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#website"},"primaryImageOfPage":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/#primaryimage"},"image":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/#primaryimage"},"thumbnailUrl":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg","datePublished":"2015-08-10T08:17:57+00:00","dateModified":"2015-08-23T06:28:37+00:00","author":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea"},"description":"La sonde Cassini a photographi\u00e9 d'\u00e9tonnants arcs de cercle rouge\u00e2tres \u00e0 la surface de T\u00e9thys, l'une des lunes glac\u00e9es de la plan\u00e8te Saturne.","inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/10\/de-mysterieuses-lignes-rouges-sur-le-satellite-tethys\/#primaryimage","url":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg","contentUrl":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/07\/tethys.jpg","width":1264,"height":900,"caption":"De myst\u00e9rieuses lignes rouges sur T\u00e9thys"},{"@type":"WebSite","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#website","url":"https:\/\/blogs.futura-sciences.com\/feldmann\/","name":"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel","description":""J'ai en moi un besoin terrible. Dirais-je le mot? La religion. Alors, je sors la nuit et je peins des \u00e9toiles." Vincent van Gogh","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/blogs.futura-sciences.com\/feldmann\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Person","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea","name":"Jean-Baptiste FELDMANN","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g","caption":"Jean-Baptiste FELDMANN"},"url":"https:\/\/blogs.futura-sciences.com\/feldmann\/author\/jbfe\/"}]}},"_links":{"self":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts\/3346","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/comments?post=3346"}],"version-history":[{"count":4,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts\/3346\/revisions"}],"predecessor-version":[{"id":3351,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts\/3346\/revisions\/3351"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/media\/3347"}],"wp:attachment":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/media?parent=3346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/categories?post=3346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/tags?post=3346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}