{"id":1005,"date":"2004-11-15T13:50:00","date_gmt":"2004-11-15T12:50:00","guid":{"rendered":"https:\/\/kids.esa.int\/what_is_space\/"},"modified":"2026-10-08T00:34:45","modified_gmt":"2026-10-07T22:34:45","slug":"what_is_space","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/what_is_space\/","title":{"rendered":"Qu\u2019est-ce que l\u2019espace?"},"content":{"rendered":"<div class=\"lede\">\n<p>Dans l'espace, personne ne vous entend crier. C'est parce qu'il n'y a pas d'air dans l'espace \u2013 c'est le vide. Les ondes sonores ne peuvent pas voyager dans le vide.<\/p>\n<\/div>\n<p>\u2018L\u2019\u00ab espace \u00bb commence \u00e0 environ 100 km au-dessus de la Terre, l\u00e0 o\u00f9 la couche d\u2019air qui entoure notre plan\u00e8te s\u2019estompe. En l\u2019absence d\u2019air pour diffuser la lumi\u00e8re du soleil et cr\u00e9er un ciel bleu, l\u2019espace appara\u00eet comme une couverture noire parsem\u00e9e d\u2019\u00e9toiles.<\/p>\n<p>On pense g\u00e9n\u00e9ralement que l\u2019espace est enti\u00e8rement vide. Mais ce n'est pas vrai. Les larges distances qui s\u00e9parent les \u00e9toiles et les plan\u00e8tes sont remplis d'\u00e9normes quantit\u00e9s de gaz et de poussi\u00e8re diffuses. M\u00eame les parties les plus vides de l'espace contiennent au moins quelques centaines d'atomes ou de mol\u00e9cules par m\u00e8tre cube.<\/p>\n<p>L'espace est aussi rempli de nombreuses formes de rayonnements qui sont dangereuses pour les astronautes. La majeure partie de ces rayonnements infrarouges et ultra-violets provient du Soleil. Des rayons X \u00e0 haute \u00e9nergoe, des rayons gamma et des rayons cosmiques \u2013 des particules qui se d\u00e9placent presque \u00e0 la vitesse de la lumi\u00e8re \u2013 arrivent des syst\u00e8mes stellaires lointains.<\/p>","protected":false},"excerpt":{"rendered":"<p>In space, no one can hear you scream. This is because there is no air in space \u2013 it is a vacuum. Sound waves cannot travel through a vacuum. &#8216;Outer [&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\/2004\/12\/earth_from_space2\/17871152-2-eng-GB\/Earth_from_space.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\/2004\/12\/Earth_from_space2","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":[10,11,19],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-1005","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-story-of-the-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1005","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=1005"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1005\/revisions"}],"predecessor-version":[{"id":2148,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/1005\/revisions\/2148"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=1005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=1005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=1005"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=1005"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=1005"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=1005"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=1005"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=1005"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=1005"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=1005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}