{"id":915,"date":"2008-07-11T09:58:00","date_gmt":"2008-07-11T07:58:00","guid":{"rendered":"https:\/\/kids.esa.int\/soho_discovers_thousands_of_comets\/"},"modified":"2026-10-08T00:33:43","modified_gmt":"2026-10-07T22:33:43","slug":"soho_discovers_thousands_of_comets","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/soho_discovers_thousands_of_comets\/","title":{"rendered":"SOHO d\u00e9couvre des milliers de com\u00e8tes"},"content":{"rendered":"<div class=\"lede\">\n<p>Depuis le d\u00e9but des op\u00e9rations en 1996, la sonde de l\u2019ESA et de la NASA, SOHO, passe son temps \u00e0 observer en permanence l\u2019\u00e9norme Soleil caniculaire. L'un de ses instruments, appel\u00e9 LASCO, sert \u00e0 observer l'atmosph\u00e8re ext\u00e9rieure du Soleil (la couronne). La cam\u00e9ra aguerrie LASCO a \u00e9galement r\u00e9v\u00e9l\u00e9 une formidable capacit\u00e9 \u00e0 d\u00e9tecter les petits morceaux de glace sale que nous appelons \u00ab com\u00e8tes \u00bb. En septembre 2010, SOHO avait d\u00e9nombr\u00e9 plus de 1 900 com\u00e8tes, plus que tous les autres chasseurs de com\u00e8tes r\u00e9unis. Pas mal pour un satellite qui avait \u00e9t\u00e9 con\u00e7u pour observer la plus proche de nos \u00e9toiles.<\/p>\n<\/div>\n<p>Les com\u00e8tes sont des amas de glace et de poussi\u00e8re \u2013 des \u2018 vestiges \u2019 de la formation des plan\u00e8tes il y a 4,5 milliards d\u2019ann\u00e9es. Toutes les com\u00e8tes tournent autour du Soleil, et beaucoup d\u2019entre elles sont des com\u00e8tes rasantes, passant tr\u00e8s pr\u00e8s de sa surface br\u00fblante. Certaines des com\u00e8tes qui gravitent autour du Soleil apparaissent sous forme de minuscules points ou de tra\u00een\u00e9es sur les images de SOHO \u2013 mais toutes ne survivent pas \u00e0 ce passage enflamm\u00e9. Beaucoup d\u2019entre elles se vaporisent ou plongent dans l\u2019\u00e9toile.<\/p>\n<p>Globalement, 85 % des d\u00e9couvertes de SOHO sont des morceaux d\u2019une com\u00e8te autrefois g\u00e9ante qui s\u2019est d\u00e9sagr\u00e9g\u00e9e en passant trop pr\u00e8s du Soleil il y a probablement plusieurs si\u00e8cles de cela.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2003\/11\/Artist_s_impression_of_SOHO_spacecraft2\" 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\/2003\/11\/artist_s_impression_of_soho_spacecraft2\/17874814-2-eng-GB\/Artist_s_impression_of_SOHO_spacecraft.jpg\" alt=\"Artist&#x27;s impression of SOHO spacecraft\"><figcaption>Repr\u00e9sentation artistique de la sonde spatiale SOHO<\/figcaption><\/figure>\n<p>Pr\u00e8s de 85 % des d\u00e9couvertes de SOHO sont en fait des morceaux d\u2019une com\u00e8te qui a d\u00fb \u00eatre gigantesque, d\u00e9chiquet\u00e9e au cours d\u2019un plongeon mortel vers le Soleil, il y a probablement des si\u00e8cles de cela. Ses fragments passent maintenant \u00e0 1,5 millions de km de la surface du Soleil quand ils reviennent du fin fond de l\u2019espace.<\/p>\n<p>Bien s\u00fbr, LASCO n\u2019effectue pas les d\u00e9tections tout seul. Cette t\u00e2che revient \u00e0 un groupe de volontaires extr\u00eamement comp\u00e9tents qui scannent les images d\u00e8s qu\u2019elles sont t\u00e9l\u00e9charg\u00e9es. Une fois transmises \u00e0 la Terre par SOHO, les images peuvent \u00eatre mises sur Internet, pr\u00eates \u00e0 \u00eatre analys\u00e9es, 15 minutes \u00e0 peine apr\u00e8s la prise.<\/p>","protected":false},"excerpt":{"rendered":"<p>Since beginning operations in 1996, the ESA\/NASA SOHO spacecraft has spent its time staring non-stop at the enormous, sizzling Sun. One of its instruments, called LASCO, is used to observe [&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\/2008\/06\/soho_s_record-breaking_discovery2\/17871744-2-eng-GB\/SOHO_s_record-breaking_discovery.jpg","esa_banner_description":"SOHO's record-breaking discovery","esa_banner_credit":"ESA\/ NASA\/ SOHO","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/06\/SOHO_s_record-breaking_discovery2","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":[46,10,11],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-915","post","type-post","status-publish","format-standard","hentry","category-comets-and-meteors","category-learn","category-our-universe"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/915","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=915"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/915\/revisions"}],"predecessor-version":[{"id":4737,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/915\/revisions\/4737"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=915"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=915"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=915"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=915"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=915"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=915"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=915"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=915"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=915"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}