{"id":545,"date":"2015-01-28T07:45:00","date_gmt":"2015-01-28T06:45:00","guid":{"rendered":"https:\/\/kids.esa.int\/getting_to_know_rosetta_s_comet\/"},"modified":"2026-10-08T00:29:28","modified_gmt":"2026-10-07T22:29:28","slug":"getting_to_know_rosetta_s_comet","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/getting_to_know_rosetta_s_comet\/","title":{"rendered":"Rosetta apprend \u00e0 conna\u00eetre sa com\u00e8te"},"content":{"rendered":"
\n

Des centaines d\u2019ann\u00e9es se sont \u00e9coul\u00e9es depuis que Christophe Colomb a parcouru la Terre \u00e0 la recherche de nouveaux mondes... mais l\u2019\u00e8re des grandes explorations est loin d\u2019\u00eatre termin\u00e9e ! Notre vaste Univers rec\u00e8le d\u2019innombrables myst\u00e8res, \u00e0 l\u2019image de la com\u00e8te 67P\/Churyumov-Gerasimenko qu\u2019explore actuellement la sonde spatiale Rosetta.<\/p>\n<\/div>\n

Apr\u00e8s avoir ralli\u00e9 la com\u00e8te au mois d\u2019ao\u00fbt dernier, Rosetta a d\u00e9j\u00e0 examin\u00e9 les deux tiers de sa surface. Les r\u00e9sultats initiaux s\u2019av\u00e8rent extr\u00eamement prometteurs. Nous avons ainsi d\u00e9couvert que la com\u00e8te \u00e9tait compos\u00e9e de r\u00e9gions tr\u00e8s vari\u00e9es, certaines \u00e9tant recouvertes d\u2019une \u00e9paisse poussi\u00e8re alors que d\u2019autres accueillent d\u2019immenses falaises et canyons. Plusieurs zones sont quand \u00e0 elles parsem\u00e9es de fosses et d\u2019amas rocheux, sans oublier les d\u00e9serts arides qui recouvrent certains secteurs du corps c\u00e9leste.<\/p>\n

Les abruptes parois rocheuses de la com\u00e8te sont parcourues d\u2019inqui\u00e9tantes fissures. La plus importante d\u2019entre elles mesure 500 m\u00e8tres, soit la longueur de cinq terrains de football !<\/p>\n

L\u2019un des autres aspects les plus frappants de la com\u00e8te r\u00e9side dans les jets de gaz qui jaillissent de sa surface. La mati\u00e8re qu\u2019ils expulsent agit comme le vent sur Terre, en \u00e9parpillant de la poussi\u00e8re partout sur la com\u00e8te. Ce ph\u00e9nom\u00e8ne physique contribue \u00e0 cr\u00e9er des ondulations \u00e0 la surface de l\u2019objet c\u00e9leste, \u00e0 la mani\u00e8re des mar\u00e9es sur le sable des plages de la Terre.<\/p>\n

Les quelques mois que Rosetta a pass\u00e9 pr\u00e8s sa com\u00e8te nous ont d\u00e9j\u00e0 livr\u00e9 une masse colossale d\u2019informations. En continuant de nous transmettre de pr\u00e9cieuses donn\u00e9es pendant toute l\u2019ann\u00e9e 2015, la sonde spatiale devrait aider la communaut\u00e9 scientifique \u00e0 percer les myst\u00e8res qui entourent la formation de notre syst\u00e8me solaire !<\/p>\n

Anecdote sympa :<\/b> Une journ\u00e9e sur la com\u00e8te de Rosetta dure la moiti\u00e9 d'une journ\u00e9e terrestre, soit seulement 12 heures. Mais il lui faut six fois plus de temps qu'\u00e0 la Terre pour effectuer une r\u00e9volution autour du Soleil.<\/p>","protected":false},"excerpt":{"rendered":"

It\u2019s been hundreds of years since Christopher Columbus sailed the Earth discovering new worlds \u2014 but don\u2019t let anyone tell you that the Age of Exploration is over. The Universe […]<\/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\/2015\/01\/comet_from_8_km2\/17887284-2-eng-GB\/Comet_from_8_km.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2015\/01\/Comet_from_8_km2","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-545","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/545","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=545"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/545\/revisions"}],"predecessor-version":[{"id":1688,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/545\/revisions\/1688"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=545"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=545"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=545"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=545"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=545"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=545"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=545"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}