{"id":72641,"date":"2025-11-15T12:00:00","date_gmt":"2025-11-15T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/centre-ou-confins-de-la-voie-lactee"},"modified":"2025-11-16T02:59:22","modified_gmt":"2025-11-16T02:59:22","slug":"centre-ou-confins-de-la-voie-lactee","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee","title":{"rendered":"Centre ou Confins de la Voie Lacte\u0301e?"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Quand on le\u0300ve les yeux la nuit pour observer la Voie lacte\u0301e, est-ce qu\u2019on regarde en direction de son centre, ou bien est-ce que c\u2019est en direction de l\u2019un de ses bras les plus e\u0301loigne\u0301s, donc du co\u0302te\u0301 oppose\u0301? \u00bb, nous demande Carline Julow sur notre page Facebook. C\u2019est notre question de lecteur de la semaine.<\/p>\n<p>Quand on admire la Voie lacte\u0301e a\u0300 l\u2019\u0153il nu, cette bande laiteuse qui traverse le ciel d\u2019e\u0301te\u0301, on regarde en re\u0301alite\u0301 dans le plan du disque de notre galaxie, c\u2019est-a\u0300-dire au sein me\u0302me de sa structure spirale\u0301e. Mais selon la saison et la direction du regard, on ne contemple pas le me\u0302me secteur: parfois le centre galactique, parfois les re\u0301gions plus pe\u0301riphe\u0301riques.<\/p>\n<p><b>En e\u0301te\u0301, on regarde en direction du centre de la galaxie<\/b><\/p>\n<p>Le centre de la Voie lacte\u0301e se trouve dans la constellation du Sagittaire, le\u0301ge\u0300rement au sud de celle du Scorpion (voir l\u2019image ci-dessous). C\u2019est dans cette zone du ciel que la bande lumineuse de la Voie lacte\u0301e est la plus dense, la plus riche en e\u0301toiles et en nuages sombres de poussie\u0300re interstellaire.<\/p>\n<p>En regardant dans cette direction, typiquement durant les nuits d\u2019e\u0301te\u0301 dans l\u2019he\u0301misphe\u0300re Nord (juin a\u0300 aou\u0302t), on observe vers le c\u0153ur de notre galaxie, situe\u0301 a\u0300 environ 26 000 anne\u0301es-lumie\u0300re de nous, au c\u0153ur du bulbe central ou\u0300 re\u0301side le trou noir supermassif Sagittarius A*.<\/p>\n<p><b>En hiver, on regarde en direction des bras plus lointains<\/b><\/p>\n<p>En revanche, lorsque la Voie lacte\u0301e est visible en hiver, la bande lumineuse que l\u2019on voit correspond a\u0300 une tout autre portion du disque galactique: on regarde alors vers l\u2019exte\u0301rieur, c\u2019est-a\u0300-dire en direction de bras spiraux plus lointains (notamment ceux de Perse\u0301e et d\u2019Orion). Autrement dit, a\u0300 cette saison, notre regard plonge vers le bord du disque galactique, loin du centre.<\/p>\n<p>Si on imagine la Voie lacte\u0301e comme un vaste disque vu de dessus (comme sur l\u2019image ci-dessus): notre Syste\u0300me solaire se situe a\u0300 environ deux tiers du rayon depuis le centre, sur un petit bras secondaire (le bras d\u2019Orion). En levant les yeux, nous regardons a\u0300 ras du disque, tanto\u0302t vers le centre (Sagittaire), tanto\u0302t vers l\u2019exte\u0301rieur (Orion), mais rarement \u00ab au-dessus \u00bb ou \u00ab en dessous \u00bb de la galaxie.<\/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. Quand on le\u0300ve les yeux la nuit pour observer la Voie lacte\u0301e, est-ce qu\u2019on regarde en direction de son centre, ou bien est-ce que c\u2019est en direction de l\u2019un de ses bras les plus e\u0301loigne\u0301s, donc du co\u0302te\u0301 oppose\u0301? \u00bb, nous demande Carline Julow sur notre page Facebook. C\u2019est notre question de [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":72640,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-72641","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>Centre ou Confins de la Voie Lacte\u0301e? - Senegal<\/title>\n<meta name=\"description\" content=\"Quand on le\u0300ve les yeux la nuit pour observer la Voie lacte\u0301e, est-ce qu\u2019on regarde en direction de son centre, ou bien ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Centre ou Confins de la Voie Lacte\u0301e?\" \/>\n<meta property=\"og:description\" content=\"Quand on le\u0300ve les yeux la nuit pour observer la Voie lacte\u0301e, est-ce qu\u2019on regarde en direction de son centre, ou bien ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-11-15T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-16T02:59:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/11\/sm_1763290633.123075.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"899\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Centre ou Confins de la Voie Lacte\u0301e?\",\"datePublished\":\"2025-11-15T12:00:00+00:00\",\"dateModified\":\"2025-11-16T02:59:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee\"},\"wordCount\":443,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/11\/sm_1763290633.123075.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/centre-ou-confins-de-la-voie-lactee\",\"name\":\"Centre ou Confins de la Voie Lacte\u0301e? 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