{"id":928,"date":"2004-11-15T16:00:00","date_gmt":"2004-11-15T15:00:00","guid":{"rendered":"https:\/\/kids.esa.int\/saturn_the_gas_giant\/"},"modified":"2026-10-08T00:33:52","modified_gmt":"2026-10-07T22:33:52","slug":"saturn_the_gas_giant","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/saturn_the_gas_giant\/","title":{"rendered":"Saturne - la g\u00e9ante gazeuse"},"content":{"rendered":"
\n

Saturne est la sixi\u00e8me plan\u00e8te \u00e0 partir du Soleil. On pensait qu'elle \u00e9tait la plan\u00e8te la plus lointaine jusqu'\u00e0 ce que le t\u00e9lescope soit invent\u00e9.<\/p>\n<\/div>\n

Seconde en taille apr\u00e8s Jupiter, Saturne est principalement compos\u00e9e des gaz l\u00e9gers que sont l'hydrog\u00e8ne et l'h\u00e9lium. Saturne pourrait int\u00e9grer 764 Terres mais cette g\u00e9ante gazeuse ne p\u00e8se que 95 fois notre monde rocheux. Si l'on pouvait mettre toutes les plan\u00e8tes dans une piscine, Saturne serait la seule \u00e0 pouvoir flotter.<\/p>\n

Malgr\u00e9 sa taille, Saturne fait un tour complet sur elle-m\u00eame en un peu plus de 10 heures. Elle tourne si vite que son \u00e9quateur est boursoufl\u00e9, un peu comme un ballon qui a \u00e9t\u00e9 \u00e9cras\u00e9.<\/p>\n

Vue au t\u00e9lescope, Saturne a une couleur jaune p\u00e2le. Elle n'a pas de surface solide, et ce que nous voyons sont les nuages qui apparaissent sous la forme de bandes claires et sombres. Ces nuages sont balay\u00e9s par des vents tr\u00e8s puissants. Une grande partie de la chaleur qui alimente ces vents provient de l'int\u00e9rieur de la plan\u00e8te. Au-del\u00e0 des nuages, on trouve un syst\u00e8me d'anneaux plats en forme de disque.<\/p>\n

Presque tout ce que nous savons sur Saturne nous provient de la mission Cassini-Huygens, men\u00e9e conjointement par la NASA et l\u2019ESA. L\u2019orbiteur Cassini est en orbite autour de la plan\u00e8te depuis le 1er juillet 2004. Il a explor\u00e9 nombre des lunes de Saturne, en particulier Titan, qui a la taille d\u2019une plan\u00e8te. Il a \u00e9galement transmis de formidables images d\u00e9taill\u00e9es et autres pr\u00e9cieuses donn\u00e9es sur les orages sur Saturne, sur ses milliers de petits anneaux de glace et sur son champ magn\u00e9tique.<\/p>\n

Le 14 janvier 2005, la sonde europ\u00e9enne Huygens est descendue en parachute sur Titan, devenant ainsi la premi\u00e8re sonde \u00e0 traverser l'atmosph\u00e8re pour se poser \u00e0 la surface d'un satellite plan\u00e9taire (autre que notre Lune). Titan s\u2019est av\u00e9r\u00e9 \u00eatre un \u00e9trange monde de glace o\u00f9 des pluies de m\u00e9thane alimentent les lacs et les rivi\u00e8res.<\/p>","protected":false},"excerpt":{"rendered":"

Saturn is the sixth planet from the Sun. It was thought to be the furthest of the planets until the telescope was invented. Second only in size to Jupiter, Saturn […]<\/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\/12\/colourful_saturn_getting_closer2\/17872779-2-eng-GB\/Colourful_Saturn_getting_closer.jpg","esa_banner_description":"Colourful Saturn, getting closer","esa_banner_credit":"NASA\/JPL\/Space Science Institute","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/12\/Colourful_Saturn_getting_closer2","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-928","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\/928","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=928"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/928\/revisions"}],"predecessor-version":[{"id":2071,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/928\/revisions\/2071"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=928"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=928"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=928"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=928"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=928"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=928"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=928"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=928"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=928"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}