{"id":966,"date":"2005-01-03T12:57:00","date_gmt":"2005-01-03T11:57:00","guid":{"rendered":"https:\/\/kids.esa.int\/touch_down_on_titan\/"},"modified":"2026-10-08T00:34:18","modified_gmt":"2026-10-07T22:34:18","slug":"touch_down_on_titan","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/touch_down_on_titan\/","title":{"rendered":"Arriv\u00e9e sur Titan"},"content":{"rendered":"<div class=\"lede\">\n<p>Il y a 450 ans, un astronome hollandais Christiaan Huygens d\u00e9couvrait une grosse lune en orbite autour de Saturne. Elle fut appel\u00e9e Titan, du nom du g\u00e9ant de la mythologie grecque.<\/p>\n<\/div>\n<p>Titan est bien un g\u00e9ant - le second satellite par la taille de notre syst\u00e8me solaire. Toutefois, Titan reste aujourd'hui encore envelopp\u00e9 de myst\u00e8re. Sa surface est cach\u00e9e sous une \u00e9paisse couche de brume orange.<\/p>\n<p>Les scientifiques savent que son atmosph\u00e8re \u00e9paisse est essentiellement compos\u00e9e d\u2019azote, comme la Terre. Elle contient \u00e9galement du m\u00e9thane, le gaz que nous br\u00fblons dans nos maisons et nos usines.<\/p>\n<p>Mais la temp\u00e9rature sur Titan est de -180\u00b0C, suffisamment froide pour former de la glace aussi dure que le roc. Il y fait probablement bien trop froid pour permettre toute forme de vie, m\u00eame si l'on pense qu'un oc\u00e9an se dissimule en profondeur sous ce manteau de glace.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"2105\" data-credit=\"ESA-D. DUCROS\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/Artist_view4\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2004\/12\/artist_view4\/17889874-2-eng-GB\/Artist_view.jpg\" alt=\"Artist view\"><figcaption>Point de vue de l'artiste<\/figcaption><\/figure>\n<p>La seule fa\u00e7on de percer les secrets de Titan est d'y envoyer une sonde. Le 14 janvier prochain, la sonde Huygens de l'ESA sera parachut\u00e9e \u00e0 travers l'atmosph\u00e8re.<\/p>\n<p>Ses six instruments prendront les premi\u00e8res images de cette surface encore inconnue et nous r\u00e9v\u00e9leront \u00e0 quoi ressemble vraiment Titan. Huygens touchera le sol \u00e0 une vitesse de 5 m par seconde \u2013 comme si l'on sautait d'une chaise sur le sol.<\/p>\n<p>Va-t-elle s'\u00e9craser sur la glace, s'engouffrer dans une mer de m\u00e9thane ou plonger dans une masse de vase ? Vous le saurez bient\u00f4t !<\/p>","protected":false},"excerpt":{"rendered":"<p>450 years ago, a Dutch astronomer named Christiaan Huygens discovered a large moon orbiting Saturn. It was eventually named Titan, after a giant in old Greek legends. Titan was indeed [&hellip;]<\/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\/2000\/10\/christiaan_huygens_1629-16952\/17866452-3-eng-GB\/Christiaan_Huygens_1629-1695.jpg","esa_banner_description":"Christiaan Huygens (1629-1695)","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2000\/10\/Christiaan_Huygens_1629-16952","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":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-966","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/966","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=966"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/966\/revisions"}],"predecessor-version":[{"id":4759,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/966\/revisions\/4759"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=966"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=966"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=966"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=966"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=966"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=966"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=966"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=966"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=966"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}