{"id":925,"date":"2004-11-15T14:00:00","date_gmt":"2004-11-15T13:00:00","guid":{"rendered":"https:\/\/kids.esa.int\/star_birth\/"},"modified":"2026-10-08T00:33:50","modified_gmt":"2026-10-07T22:33:50","slug":"star_birth","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/star_birth\/","title":{"rendered":"Naissance d\u2019une \u00e9toile"},"content":{"rendered":"
\n

Tout comme les \u00eatres humains, les \u00e9toiles naissent, vieillissent et meurent. Elles naissent dans d\u2019immenses nuages froids de gaz et de poussi\u00e8re, appel\u00e9s \u2018 n\u00e9buleuses \u2019. La plus c\u00e9l\u00e8bre d\u2019entre elles est la n\u00e9buleuse d\u2019Orion, qui est \u00e0 peine visible \u00e0 l\u2019\u0153il nu.<\/p>\n<\/div>\n

A mesure quils r\u00e9tr\u00e9cissent, les nuages se divisent en 'proto\u00e9toiles'. Chaque proto\u00e9toile devient alors si chaude et si dense que des r\u00e9actions nucl\u00e9aires se d\u00e9clenchent. Lorsque la temp\u00e9rature atteint 10 millions de degr\u00e9s, la proto\u00e9toile devient une nouvelle \u00e9toile.<\/p>\n

Apr\u00e8s leur naissance, la plupart des jeunes \u00e9toiles se trouvent au centre d'un disque plat de gaz et de poussi\u00e8re. Une grande partie de cette mati\u00e8re est emport\u00e9e par le rayonnement de l'\u00e9toile. Avant que cela se produise, des plan\u00e8tes peuvent se former autour de l'\u00e9toile centrale.<\/p>\n

\"Star-forming
Un nuage sombre de formation stellaire photographi\u00e9 par l'ISO<\/figcaption><\/figure>\n

Les observatoires infrarouges sont capables de d\u00e9tecter la chaleur \u00e9manant d\u2019\u00e9toiles invisibles qui se forment \u00e0 l\u2019int\u00e9rieur de ces nuages. L\u2019un des plus puissants d\u2019entre eux est l\u2019observatoire spatial Herschel de l\u2019ESA, lanc\u00e9 en mai 2009. Herschel passera au moins trois ans \u00e0 \u00e9tudier les nuages poussi\u00e9reux o\u00f9 naissent les \u00e9toiles, grandes et petites.<\/p>","protected":false},"excerpt":{"rendered":"

Like people, stars are born, they grow old and they die. Their birth places are huge, cold clouds of gas and dust, known as ‘nebulas’. The most famous of these […]<\/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\/nearby_galaxy_ngc_1569_is_a_hotbed_of_star_birth_activity2\/17880180-2-eng-GB\/Nearby_galaxy_NGC_1569_is_a_hotbed_of_star_birth_activity.jpg","esa_banner_description":"Nearby galaxy NGC 1569 is a 'hotbed' of star birth activity","esa_banner_credit":"ESA, NASA and Peter Anders (G\u00f6ttingen University Galaxy Evolution Group, Germany)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2004\/01\/Nearby_galaxy_NGC_1569_is_a_hotbed_of_star_birth_activity2","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":[10,11,21],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-925","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/925","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=925"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/925\/revisions"}],"predecessor-version":[{"id":4742,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/925\/revisions\/4742"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=925"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=925"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=925"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=925"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=925"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=925"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=925"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}