{"id":922,"date":"2004-11-15T15:45:00","date_gmt":"2004-11-15T14:45:00","guid":{"rendered":"https:\/\/kids.esa.int\/water_on_mars\/"},"modified":"2026-10-08T00:33:48","modified_gmt":"2026-10-07T22:33:48","slug":"water_on_mars","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/water_on_mars\/","title":{"rendered":"De l'eau sur Mars"},"content":{"rendered":"
\n

De toutes les plan\u00e8tes, Mars est celle qui ressemble le plus \u00e0 la Terre. Un visiteur trouverait qu'une journ\u00e9e sur Mars est \u00e0 peine plus longue qu'une journ\u00e9e sur Terre. Mars a \u00e9galement une inclinaison semblable \u00e0 celle de la Terre, elle a donc aussi des saisons.<\/p>\n<\/div>\n

Mars et la Terre poss\u00e8dent toutes deux des calottes polaires blanches. Celles de Mars sont bien plus petites et moins \u00e9paisses ; elles s'\u00e9tendent donc rapidement en hiver et disparaissent presque enti\u00e8rement en \u00e9t\u00e9. Elles sont bien plus froides que les calottes polaires terrestres et contiennent donc du dioxyde de carbone gel\u00e9 (la \u2018 glace s\u00e8che \u2019 utilis\u00e9e pour cr\u00e9er du brouillard dans les spectacles) ainsi que de la glace d'eau.<\/p>\n

\"Cracks
Des fissures sur Mars laissent supposer la pr\u00e9sence d'eau<\/figcaption><\/figure>\n

Mars est en pleine \u00e8re glaciaire \u00e0 l'heure actuelle, il ne peut donc pas y avoir d\u2019eau liquide \u00e0 sa surface, mais plusieurs \u00e9l\u00e9ments laissent \u00e0 penser qu\u2019elle a \u00e9t\u00e9 plus chaude et plus humide dans le pass\u00e9.<\/p>\n

Des canaux sinueux qui ressemblent \u00e0 des lits de rivi\u00e8re dess\u00e9ch\u00e9s ont \u00e9t\u00e9 observ\u00e9s sur les images prises par les sondes. Elles indiquent que d'\u00e9normes volumes d'eau se sont autrefois \u00e9coul\u00e9s \u00e0 la surface \u2013 aliment\u00e9s peut-\u00eatre par la fonte des glaces. Il peut \u00e9galement y avoir eu de la pluie et de la neige. Nombre de ces canaux semblent avoir jadis rempli de gros crat\u00e8res ou s\u2019\u00eatre d\u00e9vers\u00e9s dans les plaines septentrionales. Certains scientifiques \u00e9voquent la pr\u00e9sence d\u2019un grand oc\u00e9an qui couvrait la moiti\u00e9 nord de Mars.<\/p>\n

O\u00f9 cette eau est-elle pass\u00e9e? Certains pensent qu'elle s'est \u00e9chapp\u00e9e dans l'espace. Le reste est certainement gel\u00e9 dans le sol.<\/p>","protected":false},"excerpt":{"rendered":"

In many ways, Mars is the most Earthlike of all the planets. A visitor would find that a day on Mars is only slightly longer than one on Earth. Mars […]<\/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\/omega_image_of_the_southern_polar_cap_of_mars_18_january2\/17912443-2-eng-GB\/OMEGA_image_of_the_southern_polar_cap_of_Mars_18_January.jpg","esa_banner_description":"OMEGA image of the southern polar cap of Mars 18 January","esa_banner_credit":"ESA - OMEGA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/01\/OMEGA_image_of_the_southern_polar_cap_of_Mars_18_January2","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":[10,11,12],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-922","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/922","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=922"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/922\/revisions"}],"predecessor-version":[{"id":4741,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/922\/revisions\/4741"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=922"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=922"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=922"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=922"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=922"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=922"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=922"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}