{"id":1795,"date":"2015-02-07T09:12:04","date_gmt":"2015-02-07T09:12:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1795"},"modified":"2015-02-13T12:12:57","modified_gmt":"2015-02-13T12:12:57","slug":"incroyables-changements-la-surface-de-la-comete-67p","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/","title":{"rendered":"Incroyables changements \u00e0 la surface de la com\u00e8te 67P"},"content":{"rendered":"

Jamais encore les plan\u00e9tologues n’avaient pu suivre les transformations d’une com\u00e8te au fil des semaines. C’est d\u00e9sormais possible avec la sonde europ\u00e9enne Rosetta<\/a> qui scrute la com\u00e8te 67P\/Churyumov-Gerasimenko<\/a> (Tchouri pour les intimes) depuis le mois de novembre. Au fur et \u00e0 mesure que l’astre chevelu se rapproche du Soleil <\/a>(67P sera \u00e0 un peu plus d’une unit\u00e9 astronomique de notre \u00e9toile l’\u00e9t\u00e9 prochain), la surface de la com\u00e8te se modifie.<\/p>\n

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

Les deux images ci-dessus permettent de comparer \u00e0 un mois d’intervalle une r\u00e9gion surnomm\u00e9e \u00ab\u00a0Hapi\u00a0\u00bb. On y voit des fissures qui sont apparues et d’autres qui ont disparu entre le 9 d\u00e9cembre 2014 et le 8 janvier 2015. comment cela est-il possible ?<\/p>\n

Les scientifiques expliquent ces changements par l’action du rayonnement solaire.<\/p>\n

Il faut se souvenir que l’atterrisseur Philae<\/a> avait heurt\u00e9 un sol tr\u00e8s dur le 12 novembre 2014, une couche de glace recouverte d’une pellicule plus ou moins \u00e9paisse de poussi\u00e8re.\u00a0Lorsque le Soleil r\u00e9chauffe le sous-sol gel\u00e9 l\u00e0 o\u00f9 la couche de poussi\u00e8re est la plus fine, la glace se sublime et le sol se fissure, laissant \u00a0\u00e9chapper des jets de gaz et de poussi\u00e8re. \u00c0 l’inverse, on peut imaginer que le sol s’affaisse et que la poussi\u00e8re comble les fissures lorsque la glace a fini de se sublimer.<\/p>\n","protected":false},"excerpt":{"rendered":"

Jamais encore les plan\u00e9tologues n’avaient pu suivre les transformations d’une com\u00e8te au fil des semaines. C’est d\u00e9sormais possible avec la sonde europ\u00e9enne Rosetta qui scrute la com\u00e8te 67P\/Churyumov-Gerasimenko (Tchouri pour les intimes) depuis le mois de novembre. Au fur et \u00e0 mesure que l’astre chevelu se rapproche du Soleil (67P sera \u00e0 un peu plus … Continuer la lecture de Incroyables changements \u00e0 la surface de la com\u00e8te 67P<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1797,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[467,824,510,97,471],"class_list":["post-1795","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-churyumov-gerasimenko","tag-hapi","tag-philae","tag-soleil","tag-sonde-rosetta"],"yoast_head":"\nIncroyables changements \u00e0 la surface de la com\u00e8te 67P<\/title>\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\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Incroyables changements \u00e0 la surface de la com\u00e8te 67P\" \/>\n<meta property=\"og:description\" content=\"Jamais encore les plan\u00e9tologues n’avaient pu suivre les transformations d’une com\u00e8te au fil des semaines. 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Au fur et \u00e0 mesure que l’astre chevelu se rapproche du Soleil (67P sera \u00e0 un peu plus … Continuer la lecture de Incroyables changements \u00e0 la surface de la com\u00e8te 67P →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2015-02-07T09:12:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-02-13T12:12:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/comet2.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=\"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=\"1 minute\" \/>\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\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/\",\"name\":\"Incroyables changements \u00e0 la surface de la com\u00e8te 67P\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/comet2.jpg\",\"datePublished\":\"2015-02-07T09:12:04+00:00\",\"dateModified\":\"2015-02-13T12:12:57+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/07\/incroyables-changements-la-surface-de-la-comete-67p\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/comet2.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/02\/comet2.jpg\",\"width\":1200,\"height\":900},{\"@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. 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