{"id":74163,"date":"2026-01-06T12:00:00","date_gmt":"2026-01-06T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/carte-celeste-inedite-a-102-couleurs-par-spherex"},"modified":"2026-01-06T21:56:57","modified_gmt":"2026-01-06T21:56:57","slug":"carte-celeste-inedite-a-102-couleurs-par-spherex","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/carte-celeste-inedite-a-102-couleurs-par-spherex","title":{"rendered":"Carte C\u00e9leste In\u00e9dite \u00e0 102 Couleurs par Spherex"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Regarder loin, c\u2019est regarder dans le passe\u0301 \u00bb. Une phrase incontournable de l\u2019astronomie qui prend tout son sens quand il s\u2019agit de vouloir cartographier la vou\u0302te ce\u0301leste. Une multitude de missions spatiales comme Planck, Gaia ou SPHEREx, aspirent a\u0300 relever ce de\u0301fi titanesque. La premie\u0300re a produit une carte de\u0301taille\u0301e de l\u2019Univers primordial, a\u0302ge\u0301 de 380 000 ans, a\u0300 l\u2019instant me\u0302me ou\u0300 il e\u0301mettait sa premie\u0300re lumie\u0300re, tandis que la seconde a dresse\u0301 une cartographie pre\u0301cise de la Voie lacte\u0301e et de ses milliards d\u2019e\u0301toiles.<\/p>\n<p>SPHEREx (acronyme de \u00ab Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer \u00bb) est un te\u0301lescope de la Nasa lance\u0301 le 11 mars 2025 avec pour objectif de combiner a\u0300 la fois des informations sur notre galaxie et sur les origines du cosmos. La premie\u0300re carte du ciel du te\u0301lescope de l\u2019agence spatiale ame\u0301ricaine, de\u0301voile\u0301e en de\u0301cembre 2025, offre une vue panoramique sans pre\u0301ce\u0301dent de la vou\u0302te ce\u0301leste.<\/p>\n<p><b>Une carte du ciel ine\u0301dite en 102 couleurs<\/b><\/p>\n<p>Le te\u0301lescope SPHEREx a notamment observe\u0301 des nuages denses de poussie\u0300re et de gaz au sein de la Voie lacte\u0301e, ou\u0300 se forment e\u0301toiles et plane\u0300tes. L\u2019instrument de la Nasa effectue 14,5 orbites autour de la Terre par jour, en se de\u0301plac\u0327ant du nord vers le sud et en survolant chacun des po\u0302les, produisant environ 3 600 images quotidiennes.<\/p>\n<p>A l\u2019instar du te\u0301lescope James Webb, SPHEREx observe l\u2019Univers dans la domaine de l\u2019infrarouge, mais avec une tout autre approche: l\u2019utilisation de 102 bandes spectrales. \u00ab Nous produisons essentiellement 102 nouvelles cartes du ciel, chacune correspondant a\u0300 une longueur d\u2019onde diffe\u0301rente et contenant une information unique pour chaque objet cosmique observe\u0301 \u00bb, explique Shawn Domagal-Goldman, directeur de la division Astrophysique du sie\u0300ge de la Nasa a\u0300 Washington, dans un communique\u0301 de l\u2019agence.<\/p>\n<p>L\u2019addition de ces images colore\u0301es, collecte\u0301es entre mai et de\u0301cembre 2025, combine\u0301e au large champ de vue du te\u0301lescope, fait de SPHEREx un instrument ine\u0301dit par rapport a\u0300 d\u2019autres missions spatiales comme James Webb ou WISE (Wide-field Infrared Survey Explorer).<\/p>\n<p><b>Vers la que\u0302te des origines du cosmos<\/b><\/p>\n<p>La prochaine e\u0301tape de la mission consistera a\u0300 ge\u0301ne\u0301rer trois autres scans complets du ciel au cours des deux premie\u0300res anne\u0301es de fonctionnement du te\u0301lescope. Ces observations seront combine\u0301es afin d\u2019ame\u0301liorer la pre\u0301cision des donne\u0301es recueillies.<\/p>\n<p>\u00ab Je pense que chaque astronome y trouvera quelques chose de pre\u0301cieux, tandis que les missions de la Nasa permettent a\u0300 l\u2019humanite\u0301 de re\u0301pondre a\u0300 des questions fondamentales sur le commencement de l\u2019Univers et sur la manie\u0300re dont il a e\u0301volue\u0301 pour devenir un lieu propice a\u0300 la vie \u00bb, re\u0301sume Shawn Domagal-Goldman.<\/p>\n<p>SPHEREx e\u0301ludera en outre les origines du cosmos, notamment en analysant la distribution des galaxies. Celle-ci fournit en effet de pre\u0301cieux indices sur la pe\u0301riode de l\u2019inflation cosmologique, survenue environ 10-35 seconde apre\u0300s le Big Bang, durant laquelle l\u2019Univers a connu une expansion exponentielle.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Regarder loin, c\u2019est regarder dans le passe\u0301 \u00bb. Une phrase incontournable de l\u2019astronomie qui prend tout son sens quand il s\u2019agit de vouloir cartographier la vou\u0302te ce\u0301leste. Une multitude de missions spatiales comme Planck, Gaia ou SPHEREx, aspirent a\u0300 relever ce de\u0301fi titanesque. La premie\u0300re a produit une carte de\u0301taille\u0301e de l\u2019Univers [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":74162,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-74163","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"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>Carte C\u00e9leste In\u00e9dite \u00e0 102 Couleurs par Spherex - Senegal<\/title>\n<meta name=\"description\" content=\"Regarder loin, c\u2019est regarder dans le passe\u0301 \u00bb. 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