{"id":7381,"date":"2017-03-15T12:32:32","date_gmt":"2017-03-15T12:32:32","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7381"},"modified":"2017-03-23T06:16:28","modified_gmt":"2017-03-23T06:16:28","slug":"paysages-lunaires-a-explorer-2-le-mur-droit","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/15\/paysages-lunaires-a-explorer-2-le-mur-droit\/","title":{"rendered":"Paysages lunaires \u00e0 explorer (2) : le Mur Droit"},"content":{"rendered":"

Une simple lunette astronomique ou un petit t\u00e9lescope permettent de merveilleuses observations lunaires. D\u00e9couvrons le Mur Droit ou Rupes Recta<\/em>.<\/strong><\/p>\n

Situ\u00e9 sur la bordure EST de la Mer des Nu\u00e9es (Mare Nubium<\/em>) le Mur Droit est la seconde curiosit\u00e9 lunaire que nous allons explorer, apr\u00e8s la r\u00e9gion de Platon et Vallis Alpes<\/em><\/a>. Cette formation est observable avec un grossissement d’au moins une cinquantaine de fois juste apr\u00e8s le Premier Quartier<\/a> et avant le Dernier Quartier<\/a>.<\/p>\n

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

D\u00e9couverte en 1650 par l’astronome Christian Huygens (qui la surnommait l’\u00e9p\u00e9e dans la Lune), cette formation g\u00e9ologique est une faille de compression qui est probablement apparue lors du refroidissement de la mer des Nu\u00e9es quand une partie du bassin s’est affaiss\u00e9e.<\/p>\n

Si vous observez le Mur Droit juste apr\u00e8s le Premier Quartier (comme sur l’image ci-dessous r\u00e9alis\u00e9e par l\u2019astronome amateur Alain Brodin<\/a>)\u00a0 vous imaginerez qu’il s’agit d’une haute falaise qui projette son ombre dans la Mer des Nu\u00e9es. Mais c’est l’\u00e9clairage rasant qui produit cet effet : Rupes Recta<\/em>\u00a0(qui court sur 120 km) est en r\u00e9alit\u00e9 une d\u00e9nivellation qui relie en pente douce \u00a0la partie EST de Mare Nubium\u00a0<\/em>\u00e0 la partie OUEST situ\u00e9e 300 m plus bas. Une formation identique, le Mur de Cauchy, est observable dans la Mer de la Tranquillit\u00e9.<\/p>\n

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

Juste avant le Dernier Quartier le paysage est bien diff\u00e9rent : le Mur Droit ressemble \u00e0 une ligne blanche en raison de la lumi\u00e8re solaire qui vient cette fois de l’OUEST et \u00e9claire la falaise.<\/p>\n

Lorsque vous aurez fini d’explorer\u00a0Rupes Recta<\/em>, prenez un peu de temps pour admirer quelques jolis crat\u00e8res d’impact de part et d’autre : \u00e0 l’EST se trouve Thebit (57 km de diam\u00e8tre) avec un second crat\u00e8re, Thebit A (20 km) \u00e0 cheval sur son rempart suivi d’un troisi\u00e8me encore plus petit (Thebit L, 12 km).\u00a0\u00c0 l’OUEST se trouvent les crat\u00e8res Birt (17 km) et Birt A (7 km).<\/p>\n

PS : sur les images de cet article la Lune est orient\u00e9e telle qu\u2019elle appara\u00eet \u00e0 l\u2019\u0153il nu, dans une paire de jumelles ou une longue-vue terrestre. Dans une lunette ou un t\u00e9lescope les images sont renvers\u00e9es (SUD en haut et EST \u00e0 gauche).<\/p>\n","protected":false},"excerpt":{"rendered":"

Une simple lunette astronomique ou un petit t\u00e9lescope permettent de merveilleuses observations lunaires. D\u00e9couvrons le Mur Droit ou Rupes Recta. Situ\u00e9 sur la bordure EST de la Mer des Nu\u00e9es (Mare Nubium) le Mur Droit est la seconde curiosit\u00e9 lunaire que nous allons explorer, apr\u00e8s la r\u00e9gion de Platon et Vallis Alpes. Cette formation est … Continuer la lecture de Paysages lunaires \u00e0 explorer (2) : le Mur Droit<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7382,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[1757,2097,569,82,2096,2095,2093,2094,2098],"class_list":["post-7381","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-alain-brodin","tag-birt","tag-christian-huygens","tag-lune","tag-mare-nubium","tag-mer-des-nuees","tag-mur-droit","tag-rupes-recta","tag-thebit"],"yoast_head":"\nPaysages lunaires \u00e0 explorer (2) : le Mur Droit<\/title>\n<meta name=\"description\" content=\"Une simple lunette astronomique ou un petit t\u00e9lescope permettent de merveilleuses observations lunaires. 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