{"id":180124,"date":"2026-06-17T18:38:20","date_gmt":"2026-06-17T18:38:20","guid":{"rendered":"https:\/\/www.europesays.com\/ch-fr\/180124\/"},"modified":"2026-06-17T18:38:20","modified_gmt":"2026-06-17T18:38:20","slug":"arrakihs-un-telescope-spatial-dedie-a-larcheologie-galactique","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/ch-fr\/180124\/","title":{"rendered":"Arrakihs, un t\u00e9lescope spatial d\u00e9di\u00e9 \u00e0 l\u2019arch\u00e9ologie galactique"},"content":{"rendered":"<p>\n    R\u00c9CIT &#8211; L\u2019Agence spatiale europ\u00e9enne va lancer en orbite un observatoire pour comprendre comment se sont form\u00e9es des dizaines de galaxies proches.<\/p>\n<p class=\"fig-paragraph\">L\u2019histoire de notre galaxie,\u00a0<a href=\"http:\/\/www.lefigaro.fr\/sciences\/une-nouvelle-image-revele-les-secrets-de-la-composition-chimique-au-coeur-de-la-voie-lactee-20260227\" data-fig-type=\"NewsFlash\" data-gtm-custom-categorie=\"navigation\" data-gtm-custom-action=\"crossclick\" data-gtm-custom-label=\"Contextuel\" data-gtm-event=\"customEventSPE\" data-fig-domain=\"LEFIGARO\" rel=\"nofollow noopener\" target=\"_blank\">la Voie lact\u00e9e<\/a>, est beaucoup plus mouvement\u00e9e que son apparence actuelle pourrait le laisser penser. Constitu\u00e9e de 300\u00a0milliards d\u2019environ \u00e9toiles rassembl\u00e9es dans un grand disque avec des bras en spirale, elle est en fait le fruit de nombreuses collisions et fusions successives au cours des 13 derniers milliards d\u2019ann\u00e9es. Un domaine\u00a0<a href=\"http:\/\/www.lefigaro.fr\/sciences\/ca-va-revolutionner-tous-les-pans-de-l-astrophysique-la-france-rejoint-le-radiotelescope-geant-skao-20260605\" data-fig-type=\"NewsFlash\" data-gtm-custom-categorie=\"navigation\" data-gtm-custom-action=\"crossclick\" data-gtm-custom-label=\"Contextuel\" data-gtm-event=\"customEventSPE\" data-fig-domain=\"LEFIGARO\" rel=\"nofollow noopener\" target=\"_blank\">de l\u2019astrophysique<\/a>\u00a0est enti\u00e8rement consacr\u00e9 \u00e0 l\u2019\u00e9tude de cette longue \u00e9volution\u00a0: l\u2019arch\u00e9ologie galactique.<\/p>\n<p class=\"fig-paragraph\">Aujourd\u2019hui, une soixantaine de galaxies satellites que l\u2019on d\u00e9signe sous le terme de galaxies naines, gravitent encore autour de nous dans un rayon de 1 million d\u2019ann\u00e9es-lumi\u00e8re (soit une sph\u00e8re de dix fois le diam\u00e8tre de la Voie lact\u00e9e). Les seuls visibles \u00e0 l\u2019\u0153il nu sont les deux\u00a0<a href=\"http:\/\/www.lefigaro.fr\/sciences\/le-spectaculaire-et-inattendu-dedoublement-du-petit-nuage-de-magellan-superstar-astronomique-de-l-hemisphere-sud-20240112\" data-fig-type=\"Article\" data-gtm-custom-categorie=\"navigation\" data-gtm-custom-action=\"crossclick\" data-gtm-custom-label=\"Contextuel\" data-gtm-event=\"customEventSPE\" data-fig-domain=\"LEFIGARO\" rel=\"nofollow noopener\" target=\"_blank\">nuages de Magellan<\/a>, que l\u2019on peut observer dans l\u2019h\u00e9misph\u00e8re Sud. Plus proches de nous, quelques milliards d\u2019\u00e9toiles sont \u00e9galement \u00e9parpill\u00e9es autour de la galaxie, formant une sorte de halo stellaire diffus. Il s\u2019agit pour partie du vestige\u2026<\/p>\n<p class=\"fig-premium-paywall__infos\">\n        Cet article est r\u00e9serv\u00e9 aux abonn\u00e9s.        Il vous reste 79% \u00e0 d\u00e9couvrir.\n    <\/p>\n<p>                <img  data- alt=\"Le Figaro\" class=\"fig-img--complete fig-img\"\/><\/p>\n<p class=\"fig-premium-paywall__title\">Vente Flash<\/p>\n<p class=\"fig-premium-paywall__subtitle\">-70% sur votre abonnement. Sans engagement.<\/p>\n<p class=\"fig-premium-paywall__connect\">\n                D\u00e9j\u00e0 abonn\u00e9\u00a0?                <a class=\"fig-premium-paywall__connect-link\" href=\"https:\/\/connect.lefigaro.fr\/login?client=horizon_web&amp;type=main&amp;redirect_uri=https%3A%2F%2Fwww.lefigaro.fr%2Fsciences%2Farrakihs-un-telescope-spatial-dedie-a-l-archeologie-galactique-20260617\" data-js-gtm=\"{&quot;event&quot;:&quot;customEventGA4&quot;,&quot;eventName&quot;:&quot;click_action&quot;,&quot;feature&quot;:&quot;paywall&quot;,&quot;location&quot;:&quot;paywall&quot;,&quot;button_action&quot;:&quot;connect&quot;,&quot;click_text&quot;:&quot;Connectez-vous&quot;}\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n                    Connectez-vous<br \/>\n                <\/a>\n            <\/p>\n","protected":false},"excerpt":{"rendered":"R\u00c9CIT &#8211; L\u2019Agence spatiale europ\u00e9enne va lancer en orbite un observatoire pour comprendre comment se sont form\u00e9es des&hellip;\n","protected":false},"author":2,"featured_media":180125,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[7],"tags":[1301,6213,61,57,59,58,23,60,62,7945],"class_list":["post-180124","post","type-post","status-publish","format-standard","has-post-thumbnail","category-sciences-et-technologies","tag-astronomie","tag-galaxie","tag-science","tag-science-and-technology","tag-sciences","tag-sciences-et-technologies","tag-suisse","tag-technologies","tag-technology","tag-telescope"],"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ch_fr\/116766907218958300","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/posts\/180124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/comments?post=180124"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/posts\/180124\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/media\/180125"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/media?parent=180124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/categories?post=180124"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ch-fr\/wp-json\/wp\/v2\/tags?post=180124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}