{"id":867,"date":"2011-04-26T08:48:00","date_gmt":"2011-04-26T06:48:00","guid":{"rendered":"https:\/\/kids.esa.int\/esa_astronaut_to_launch_on_dark_matter_mission\/"},"modified":"2026-10-08T00:33:10","modified_gmt":"2026-10-07T22:33:10","slug":"esa_astronaut_to_launch_on_dark_matter_mission","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/esa_astronaut_to_launch_on_dark_matter_mission\/","title":{"rendered":"Participation d'un astronaute de l'ESA \u00e0 la mission sur la mati\u00e8re noire"},"content":{"rendered":"
\n

Regarde autour de toi. \u00c0 l'\u00e9vidence, tout est fait de mati\u00e8re solide, liquide ou gazeuse. Et pourtant, ce que tu vois est trompeur. L'univers, en grande partie, n'est pas fait de mati\u00e8re ordinaire. Il se constitue plut\u00f4t d'une \u00e9nigmatique mati\u00e8re noire et d'une \u00e9nergie sombre encore plus myst\u00e9rieuse. Pour en savoir plus sur cet univers invisible, un nouvel instrument tr\u00e8s puissant, baptis\u00e9 Spectrom\u00e8tre magn\u00e9tique Alpha (AMS-02), est sur le point d'\u00eatre livr\u00e9 sur la Station spatiale internationale (ISS).<\/p>\n<\/div>\n

L'AMS-02 sera achemin\u00e9 vers la Station fin avril, lors du dernier vol de la navette spatiale Endeavour. \u00c0 bord se trouveront \u00e9galement l'astronaute de l'ESA Roberto Vittori et cinq autres membres d'\u00e9quipage. Roberto est le premier astronaute de l'ESA \u00e0 effectuer trois missions vers la Station. Il sera \u00e9galement le dernier Europ\u00e9en \u2013 et le dernier non-Am\u00e9ricain \u2013 \u00e0 voyager \u00e0 bord de la navette.<\/p>\n

L'une de ses missions consistera \u00e0 utiliser le bras robotique d'Endeavour pour extraire le d\u00e9tecteur de particules AMS-02 de la soute et le fixer \u00e0 l'ISS. Cet instrument de sept tonnes fonctionnera pendant au moins trois ans. Il mesurera ce qui se passe lorsque des particules \u00e0 haute \u00e9nergie, appel\u00e9es \u00ab rayons cosmiques \u00bb, proviennent de galaxies lointaines. Toute particule inhabituelle cr\u00e9\u00e9e par les impacts de ces rayons cosmiques pourrait constituer une preuve de l'existence de l'antimati\u00e8re ou de la mati\u00e8re noire.<\/p>\n

On pense que des quantit\u00e9s \u00e9gales de mati\u00e8re et d\u2019antimati\u00e8re ont \u00e9t\u00e9 cr\u00e9\u00e9es lors du Big Bang, mais l\u2019antimati\u00e8re semble avoir disparu de l\u2019Univers actuel. On pense que la mati\u00e8re noire est bien plus r\u00e9pandue que la mati\u00e8re ordinaire, mais elle n\u2019a pas encore \u00e9t\u00e9 d\u00e9tect\u00e9e directement. Le nom \u2018 DAMA \u2019, donn\u00e9 \u00e0 la mission de Roberto Vittori, fait r\u00e9f\u00e9rence \u00e0 cette recherche de mati\u00e8re noire.<\/p>","protected":false},"excerpt":{"rendered":"

Look around. It seems obvious that everything is made of solids, liquids and gases. However, your eyes are being deceived. Most of the Universe is not made of ordinary matter. […]<\/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\/2007\/05\/the_ring_of_dark_matter2\/17893833-2-eng-GB\/The_ring_of_dark_matter.jpg","esa_banner_description":"","esa_banner_credit":"NASA, ESA, M. Jee and H. Ford (Johns Hopkins University)","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2007\/05\/The_ring_of_dark_matter2","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-867","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\/867","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=867"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/867\/revisions"}],"predecessor-version":[{"id":2010,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/867\/revisions\/2010"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=867"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=867"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=867"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=867"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=867"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=867"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=867"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=867"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=867"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}