{"id":4574,"date":"2016-01-09T05:12:51","date_gmt":"2016-01-09T05:12:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4574"},"modified":"2016-01-18T05:49:14","modified_gmt":"2016-01-18T05:49:14","slug":"les-beautes-du-ciel-nocturne-dans-le-desert-du-kalahari","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/09\/les-beautes-du-ciel-nocturne-dans-le-desert-du-kalahari\/","title":{"rendered":"Les beaut\u00e9s du ciel nocturne dans le d\u00e9sert du Kalahari"},"content":{"rendered":"

\u00c0 cheval sur trois pays d’Afrique, le d\u00e9sert du Kalahari est la plus vaste \u00e9tendue de sable au monde. Le ciel nocturne y d\u00e9voile ses splendeurs.\u00a0<\/strong><\/p>\n

“Grande soif”, “lieu sans eau” : en tswana, la langue officielle de l’Afrique du sud, le mot Kalahari sert \u00e0 nommer sans \u00e9quivoque la r\u00e9gion la plus s\u00e8che du globe.<\/p>\n

Le d\u00e9sert du Kalahari s’\u00e9tend sur 900.000 km\u00b2 entre les bassins des fleuves Zamb\u00e8ze et Orange et recouvre une partie du Botswana, de la Namibie et de l’Afrique du Sud. Il est la zone la plus aride d’un espace g\u00e9ographique tr\u00e8s \u00e9tendu, le bassin du Kalahari (2,5 millions de km\u00b2 qui mordent sur le Botswana, la Namibie, l’Afrique du Sud, l’Angola, la Zambie, le Zimbabwe, la R\u00e9publique du Congo et la R\u00e9publique d\u00e9mocratique du Congo).<\/p>\n

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

Si les d\u00e9serts font parfois peur, ils restent pour les astrophotographes les rares endroits \u00e9pargn\u00e9s par la pollution lumineuse<\/a>.<\/p>\n

Cette magnifique image a \u00e9t\u00e9 r\u00e9alis\u00e9e par le photographe Petr Hor\u00e1lek<\/a> dans le\u00a0d\u00e9sert du Kalahari la nuit du 12 au 13 septembre 2015. Nous allons pouvoir admirer de gauche \u00e0 droite (donc du nord au sud)\u00a0quelques-uns des plus beaux objets c\u00e9lestes au-dessus de l’arche de la Voie lact\u00e9e<\/a>.<\/p>\n

\"desert3\"<\/a><\/p>\n

On commence avec les Pl\u00e9iades<\/a>, un tr\u00e8s bel amas ouvert dans la constellation du Taureau, constellation dont l’\u00e9toile la plus brillante, Ald\u00e9baran<\/a>, se trouve \u00e0 c\u00f4t\u00e9 de l’amas des Hyades<\/a>. Vient ensuite la c\u00e9l\u00e8bre constellation d’Orion<\/a> qui semble pos\u00e9e dans une coupelle rose, la boucle de Barnard.<\/p>\n

Les deux plus brillantes \u00e9toiles du ciel, Sirius <\/a>et Canopus, nous m\u00e8nent vers les Nuages de Magellan<\/a>, deux galaxies naines d\u00e9couvertes par le navigateur portugais Fernand de Magellan au cours de son grand tour de l\u2019Am\u00e9rique du Sud entre 1519 et 1522.<\/p>\n

Cette photographie doit beaucoup \u00e0 l’incroyable sensibilit\u00e9 du capteur photographique utilis\u00e9 (10.000 iso) qui permet de r\u00e9v\u00e9ler les grandes n\u00e9bulosit\u00e9 rouges compos\u00e9es d’hydrog\u00e8ne ionis\u00e9, trop faibles pour \u00eatres d\u00e9cel\u00e9es \u00e0 l’\u0153il nu.<\/p>\n

Petr Hor\u00e1lek fait partie d’un collectif de photographes tch\u00e8ques (SAFRA-GO<\/a>) qui organise des voyages astronomiques pour admirer le ciel dans le d\u00e9sert du Kalahari.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c0 cheval sur trois pays d’Afrique, le d\u00e9sert du Kalahari est la plus vaste \u00e9tendue de sable au monde. Le ciel nocturne y d\u00e9voile ses splendeurs.\u00a0 “Grande soif”, “lieu sans eau” : en tswana, la langue officielle de l’Afrique du sud, le mot Kalahari sert \u00e0 nommer sans \u00e9quivoque la r\u00e9gion la plus s\u00e8che du … Continuer la lecture de Les beaut\u00e9s du ciel nocturne dans le d\u00e9sert du Kalahari<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":4576,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[373,863,713,1422,354,1421,843,1420,1423,410,166],"class_list":["post-4574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-aldebaran","tag-amas-des-hyades","tag-amas-des-pleiades","tag-canopus","tag-constellation-dorion","tag-desert-du-kalahari","tag-nuages-de-magellan","tag-petr-horalek","tag-safra-go","tag-sirius","tag-voie-lactee"],"yoast_head":"\nLes beaut\u00e9s du ciel nocturne dans le d\u00e9sert du Kalahari<\/title>\n<meta name=\"description\" content=\"\u00c0 cheval sur trois pays d'Afrique, le d\u00e9sert du Kalahari est la plus vaste \u00e9tendue de sable au monde. 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