{"id":15455,"date":"2023-07-17T15:31:43","date_gmt":"2023-07-17T15:31:43","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/bleu-comme-un-coucher-de-soleil-sur-mars"},"modified":"2023-07-17T16:59:55","modified_gmt":"2023-07-17T16:59:55","slug":"bleu-comme-un-coucher-de-soleil-sur-mars","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/bleu-comme-un-coucher-de-soleil-sur-mars","title":{"rendered":"Bleu comme un coucher de Soleil sur Mars"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Un petit disque blancha\u0302tre descend sur l&rsquo;horizon bleute\u0301&#8230; Ce n&rsquo;est pas un ovni, mais un coucher de Soleil sur Mars. Car notre vision d&rsquo;un cre\u0301puscule de\u0301pend de l&rsquo;atmosphe\u0300re de la plane\u0300te concerne\u0301e et de la manie\u0300re dont les mole\u0301cules et\/ou particules qui la composent diffusent les diffe\u0301rentes couleurs du rayonnement solaire.<\/p>\n<p><b>Sur Mercure, pas d&rsquo;atmosphe\u0300re : le ciel est noir et le Soleil blanc<\/b><\/p>\n<p>Dans l&rsquo;atmosphe\u0300re terrestre, les mole\u0301cules d&rsquo;oxyge\u0300ne et d&rsquo;azote diffusent surtout le bleu (courte longueur d&rsquo;onde), d&rsquo;ou\u0300 le ciel bleu. Mais quand le soleil est bas sur l&rsquo;horizon, la couche d&rsquo;atmosphe\u0300re a\u0300 traverser est plus e\u0301paisse, c&rsquo;est donc le rouge (grande longueur d&rsquo;onde) qui nous parvient, d&rsquo;ou\u0300 nos couchers de Soleil flamboyants.<\/p>\n<p>\u00ab\u00a0Sur Mars, l&rsquo;atmosphe\u0300re est charge\u0301e en poussie\u0300res qui interceptent autant les photons rouges que les bleus : le Soleil reste blanc quand il se couche\u00a0\u00bb, explique Franc\u0327ois Forget, plane\u0301tologue au CNRS. Mais, a\u0300 l&rsquo;inverse de la Terre, ce sont surtout les photons rouges qui sont diffuse\u0301s, d&rsquo;ou\u0300 la teinte orange du ciel martien, les photons bleus ne pre\u0301dominant que le soir, entrai\u0302nant un couchant bleute\u0301.<\/p>\n<p>Sur Mercure, pas d&rsquo;atmosphe\u0300re : le ciel est noir et le Soleil blanc. \u00ab\u00a0L&rsquo;orbite tre\u0300s excentrique de la plane\u0300te et sa rotation lente permettent de voir, a\u0300 certaines longitudes, le Soleil se lever, se coucher et se relever\u00a0\u00bb, souligne Franc\u0327ois Forget. Un phe\u0301nome\u0300ne qui survient quelques jours par anne\u0301e terrestre.<\/p>\n<p><b> Des milliards de plane\u0300tes ou\u0300 observer des doubles couchers de Soleil<\/b><\/p>\n<p>Sur Ve\u0301nus, le Soleil est cache\u0301 par d&rsquo;e\u0301pais nuages d&rsquo;acide sulfurique jauna\u0302tres et ses rayons peinent a\u0300 percer cette atmosphe\u0300re opaque. Bien plus loin, sur Uranus, le rouge est absorbe\u0301 par l&rsquo;hydroge\u0300ne, l&rsquo;he\u0301lium et le me\u0301thane de l&rsquo;atmosphe\u0300re et le bleu-vert est disperse\u0301, d&rsquo;ou\u0300 un cre\u0301puscule d&rsquo;azur aux notes turquoise.<\/p>\n<p>Par ailleurs, les e\u0301toiles binaires e\u0301tant majoritaires dans le Cosmos, il doit exister des milliards de plane\u0300tes ou\u0300 observer des doubles couchers de Soleil, comme sur Tatooine dans Star Wars&#8230;<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/djibouti\">Djibouti<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Un petit disque blancha\u0302tre descend sur l&rsquo;horizon bleute\u0301&#8230; Ce n&rsquo;est pas un ovni, mais un coucher de Soleil sur Mars. Car notre vision d&rsquo;un cre\u0301puscule de\u0301pend de l&rsquo;atmosphe\u0300re de la plane\u0300te concerne\u0301e et de la manie\u0300re dont les mole\u0301cules et\/ou particules qui la composent diffusent les diffe\u0301rentes couleurs du rayonnement solaire. Sur [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":15454,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-15455","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Bleu comme un coucher de Soleil sur Mars - Djibouti<\/title>\n<meta name=\"description\" content=\"Un petit disque blancha\u0302tre descend sur l&#039;horizon bleute\u0301... Ce n&#039;est pas un ovni, mais un coucher de Soleil sur Mars. 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