{"id":2306,"date":"2015-04-02T05:01:05","date_gmt":"2015-04-02T05:01:05","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2306"},"modified":"2020-11-24T17:37:50","modified_gmt":"2020-11-24T17:37:50","slug":"les-nuages-de-magellan-dans-le-ciel-du-chili","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/02\/les-nuages-de-magellan-dans-le-ciel-du-chili\/","title":{"rendered":"Les Nuages de Magellan dans le ciel du Chili"},"content":{"rendered":"

C’est au cours de son grand tour de l’Am\u00e9rique du Sud entre 1519 et 1521 que le navigateur portugais Fernand de Magellan mentionna dans son journal de bord l’existence de deux petites n\u00e9buleuses au milieu des \u00e9toiles <\/a>du ciel austral. Ces n\u00e9buleuses prirent ensuite son nom, honneur qui aurait pu revenir \u00e0 l’astronome perse Al-Soufi qui les avaient signal\u00e9es 500 ans plus t\u00f4t.<\/p>\n

\"eso1\"<\/a><\/p>\n

Les astronomes <\/a>savent aujourd’hui que les Nuages de Magellan ne sont pas des n\u00e9buleuses mais des galaxies naines. Leur forme\u00a0 irr\u00e9guli\u00e8re s’explique par les forces gravitationnelles exerc\u00e9es par la Voie lact\u00e9e<\/a>, leur imposante et plus proche voisine \u00e0 moins de 200 000 ann\u00e9es-lumi\u00e8re.<\/p>\n

Le Grand Nuage de Magellan<\/a>, \u00e0 cheval entre les constellations de la Dorade et de la Table, se\u00a0 situe \u00e0 environ 160 000 ann\u00e9es-lumi\u00e8re. Occupant dans le ciel une surface apparente \u00e9quivalente \u00e0 vingt fois la Pleine Lune<\/a>, il a longuement \u00e9t\u00e9 \u00e9tudi\u00e9 par le t\u00e9lescope spatial Hubble, ce qui a permis d’estimer \u00e0 250 millions d’ann\u00e9es son temps de rotation.<\/p>\n

Le Petit Nuage de Magellan quant \u00e0 lui se situe \u00e0 environ 197 000 ann\u00e9es-lumi\u00e8re dans la constellation du Toucan. Les deux Nuages sont s\u00e9par\u00e9s d’environ 20 degr\u00e9s apparents dans le ciel et ils sont consid\u00e9r\u00e9s \u00e0 raison comme les deux plus beaux objets c\u00e9lestes observables sans instrument.<\/p>\n

Cette tr\u00e8s belle image a \u00e9t\u00e9 r\u00e9alis\u00e9e le 15 mars 2015 par J. Colosimo pour le compte de l’ESO<\/a>. L’astrophotographe se trouvait \u00e0 c\u00f4t\u00e9 des 4 t\u00e9lescopes auxiliaires de 1,8 m\u00e8tre de diam\u00e8tre associ\u00e9s au VLT<\/a>. Ces instruments sont install\u00e9s sous le ciel le plus noir du monde, au sommet du Cerro Paranal, une montagne dans le d\u00e9sert d’Atacama au nord du Chili.<\/p>\n","protected":false},"excerpt":{"rendered":"

C’est au cours de son grand tour de l’Am\u00e9rique du Sud entre 1519 et 1521 que le navigateur portugais Fernand de Magellan mentionna dans son journal de bord l’existence de deux petites n\u00e9buleuses au milieu des \u00e9toiles du ciel austral. Ces n\u00e9buleuses prirent ensuite son nom, honneur qui aurait pu revenir \u00e0 l’astronome perse Al-Soufi … Continuer la lecture de Les Nuages de Magellan dans le ciel du Chili<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2307,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[924,279,94,633,89,923,112,96,166],"class_list":["post-2306","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-al-soufi","tag-annee-lumiere","tag-astronome","tag-eso","tag-etoile","tag-fernand-de-magellan","tag-galaxie","tag-telescope","tag-voie-lactee"],"yoast_head":"\nLes Nuages de Magellan dans le ciel du Chili<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/02\/les-nuages-de-magellan-dans-le-ciel-du-chili\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les Nuages de Magellan dans le ciel du Chili\" \/>\n<meta property=\"og:description\" content=\"C’est au cours de son grand tour de l’Am\u00e9rique du Sud entre 1519 et 1521 que le navigateur portugais Fernand de Magellan mentionna dans son journal de bord l’existence de deux petites n\u00e9buleuses au milieu des \u00e9toiles du ciel austral. 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