{"id":955,"date":"2004-11-19T08:24:00","date_gmt":"2004-11-19T07:24:00","guid":{"rendered":"https:\/\/kids.esa.int\/life_beyond_earth\/"},"modified":"2026-10-08T00:34:11","modified_gmt":"2026-10-07T22:34:11","slug":"life_beyond_earth","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/life_beyond_earth\/","title":{"rendered":"La vie au-del\u00e0 de la terre"},"content":{"rendered":"
\n

Mars \u00e9tait autrefois plus chaude et plus humide qu'aujourd'hui. Les images transmises par la sonde Mars Express de l'ESA et d'autres engins spatiaux montrent d'immenses canaux qui ressemblent \u00e0 des lits de rivi\u00e8res ass\u00e9ch\u00e9s. O\u00f9 est pass\u00e9e l'eau ?<\/p>\n<\/div>\n

Une petite quantit\u00e9 est prisonni\u00e8re des calottes glaciaires polaires. Une certaine proportion s\u2019est \u00e9chapp\u00e9e dans l\u2019espace. Mais la plus grande partie de cette eau est gel\u00e9e dans le sol et la roche.<\/p>\n

Il est possible que la vie ait commenc\u00e9 sur Mars il y a des milliards d'ann\u00e9es quand la plan\u00e8te \u00e9tait chaude et humide. Aujourd'hui, sa surface est trop froide et s\u00e8che pour accueillir la vie. Mais certains scientifiques pensent qu'il pourrait exister des formes de vie simples, par exemple des bact\u00e9ries, dans les profondeurs du sol.<\/p>\n

\"Configuration
Configuration du rover ExoMars<\/figcaption><\/figure>\n

D'ici quelques ann\u00e9es, l'ESA pr\u00e9voit d'envoyer un rover \u00e0 la recherche de traces de vie sur Mars. Cette mission sera suivie d'une autre visant \u00e0 ramener des \u00e9chantillons de roches et de sol \u00e0 des fins d'\u00e9tude scientifique.<\/p>\n

En dehors de Mars, la vie pourrait exister dans des oc\u00e9ans couverts de glace de certaines des lunes de Jupiter. Titan, la plus grosse des lunes de Saturne, est aussi un emplacement tr\u00e8s prometteur.<\/p>\n

Les scientifiques pensent que Titan ressemble \u00e0 la Terre \u00e0 ses d\u00e9buts, mais en beaucoup plus froid. En janvier 2005, la sonde Huygens de l'ESA s'est pos\u00e9e sur ce satellite glac\u00e9 et recouvert de smog. Elle y a d\u00e9couvert des lits de rivi\u00e8res ass\u00e9ch\u00e9s et des lacs parfois remplis de m\u00e9thane liquide.<\/p>","protected":false},"excerpt":{"rendered":"

Mars was once warmer and wetter than it is today. Pictures sent back by ESA’s Mars Express and other spacecraft show huge channels that look like dry river beds. Where […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2004\/01\/reull_vallis_-_hrsc_image_15_january_20043\/17873408-2-eng-GB\/Reull_Vallis_-_HRSC_image_15_January_2004.jpg","esa_banner_description":"Reull Vallis - HRSC image 15 January 2004","esa_banner_credit":"ESA\/DLR\/FU Berlin (G. Neukum)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/01\/Reull_Vallis_-_HRSC_image_15_January_20043","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[14,10,13],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-955","post","type-post","status-publish","format-standard","hentry","category-are-we-alone","category-learn","category-life-in-space","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/955","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=955"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/955\/revisions"}],"predecessor-version":[{"id":4754,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/955\/revisions\/4754"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=955"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=955"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=955"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=955"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=955"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=955"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=955"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=955"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=955"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=955"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}