{"id":3016,"date":"2015-01-07T10:10:30","date_gmt":"2015-01-07T09:10:30","guid":{"rendered":"http:\/\/reperes-astro.fr\/?p=3016"},"modified":"2025-01-07T18:04:20","modified_gmt":"2025-01-07T17:04:20","slug":"fiche-astromomes-cosmo-6","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/fiche-astromomes-cosmo-6\/","title":{"rendered":"FICHE ASTROMOMES COSMO 6"},"content":{"rendered":"\n<p>\u00a0La fiche ASTROMOMES COSMO 6 du 7 Janvier 2015 est disponible.<\/p>\n\n\n\n<p>Chaque mois ou bien lorsqu\u2019un \u00e9v\u00e8nement est observable par les enfants nous publierons cette information nomm\u00e9e \u201cFiche ASTROMOMES\u201d.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong><span style=\"text-decoration: underline;\">Le \u00ab\u00a0vide\u00a0\u00bb Intergalactique ou Interstellaire<\/span> :<\/strong><\/h2>\n\n\n\n<p>Article r\u00e9dig\u00e9 apr\u00e8s de grandes discussions avec l&rsquo;atelier scientifique du coll\u00e8ge de Sainte Genevi\u00e8ve.<\/p>\n\n\n\n<p><strong>Imaginons que je mette un grain de riz au milieu du Grand stade de Paris. Je peux\u00a0dire que le stade est vide car je dois vraiment m\u2019approcher du rond central pour apercevoir le grain.<\/strong><\/p>\n\n\n\n<p>Si l\u2019Univers est comparable\u00a0: l&rsquo;\u00e9quivalent d&rsquo;un grain de riz tous les kilom\u00e8tre en admettant que le Grand stade fait 1 km de long.<\/p>\n\n\n\n<p>Je sais que l\u2019\u00e9toile SIRIUS (la plus proche des \u00e9toiles visibles de l\u2019h\u00e9misph\u00e8re nord) est \u00e0 <strong>80\u00a0000\u00a0000\u00a0000\u00a0000 de kilom\u00e8tres du Soleil soit 8 ann\u00e9e lumi\u00e8re<\/strong>.<\/p>\n\n\n\n<p>Nous pouvons consid\u00e9rer qu\u2019on peut juxtaposer <strong>80\u00a0000 milliards de stades du SOLEIL \u00e0 SIRIUS\u2026<\/strong> soit <strong>80\u00a0000 milliards de grain de riz entre les deux \u00e9toiles\u2026<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong><span style=\"text-decoration: underline;\">Alors le vide interstellaire est il vraiment vide<\/span>\u00a0?<\/strong><\/h2>\n\n\n\n<p>Faisons une conversion&nbsp;: si un grain de riz p\u00e8se un gramme, cela fait<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>80\u00a0000 millions de kilogrammes de riz ou encore<\/li>\n\n\n\n<li>80 millions de tonnes de riz<\/li>\n<\/ul>\n\n\n\n<p>soit de quoi nourrir les TERRIENS pendant un bon de temps.<\/p>\n\n\n\n<p><strong>Si nous consid\u00e9rons la distance de le M1 -la galaxie d\u2019Androm\u00e8de- soit 2.5 millions d\u2019ann\u00e9es lumi\u00e8re, nous pourrions placer\u00a0:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>25 milliards de milliards de stades soit<\/li>\n\n\n\n<li>25 millions de milliards de kg ou<\/li>\n\n\n\n<li>25\u00a0000 milliards de tonnes de riz<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong><span style=\"text-decoration: underline;\">Alors le vide intergalactique est il vraiment vide<\/span>\u00a0?<\/strong><\/h2>\n\n\n\n<p><strong>Sachant que la consommation mondiale de riz est de 500 millions de tonnes par an, il semblerait que tous les grains entre la Voie lact\u00e9e et la galaxie d\u2019ANDROMEDE permettraient de nourrir la population actuelle de la Terre pendant 500\u00a0000 ans\u2026<\/strong><\/p>\n\n\n\n<p><span style=\"text-decoration: underline;\">CIDEHOM r\u00e9ponse de F MOTTOZ qui apporte des pr\u00e9cisions<\/span> <a href=\"http:\/\/www.cidehom.com\/question.php?_q_id=50\">http:\/\/www.cidehom.com\/question.php?_q_id=50<\/a><\/p>\n\n\n\n<p>Le vide intersid\u00e9ral a une composition tr\u00e8s vari\u00e9e qui int\u00e9resse beaucoup d&rsquo;astronomes. Ils d\u00e9nomment cet espace entre les \u00e9toiles le \u00ab\u00a0Milieu Interstellaire\u00a0\u00bb. En r\u00e9alit\u00e9, l&rsquo;espace entre les \u00e9toiles n&rsquo;est pas vide, m\u00eame si il est tr\u00e8s peu dense.<\/p>\n\n\n\n<p>On y trouve des nuages d&rsquo;hydrog\u00e8ne (atomique ou mol\u00e9culaire), des nuages contenant aussi des \u00e9l\u00e9ments plus lourds (traces de carbone, d&rsquo;oxyg\u00e8ne), parfois des mol\u00e9cules, et parfois des petits grains de poussi\u00e8re ou de minuscules particules de glace d&rsquo;eau.<\/p>\n\n\n\n<p>Les \u00e9carts de densit\u00e9 sont tr\u00e8s forts d&rsquo;un endroit \u00e0 l&rsquo;autre. Entre un nuage interstellaire (tr\u00e8s peu dense en regard de ce \u00e0 quoi on est habitu\u00e9 sur Terre) et un endroit sans nuage, il peut y avoir un rapport de densit\u00e9 de l&rsquo;ordre de 100 000. C&rsquo;est le m\u00eame \u00e9cart de densit\u00e9 qu&rsquo;il y a entre l&rsquo;air et un caillou.<\/p>\n\n\n\n<p>aire ou intergalactique est il vraiment VIDE ? Certains endroits du milieu interstellaire sont tr\u00e8s chauds (des centaines voire des millions de degr\u00e9s) lorsqu&rsquo;ils sont chauff\u00e9s par une \u00e9toile ; d&rsquo;autres fois, ils sont tr\u00e8s froids (seulement quelques Kelvin, c&rsquo;est \u00e0 dire moins de -260 degr\u00e9s Celsius) notamment l\u00e0 o\u00f9 se condensent les gaz qui formeront de futures \u00e9toiles.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/eagle-stellar-spire-hubble-e1736268923845.jpg\" alt=\"fiche astromomes\"\/><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:50%\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\"><\/div>\n<\/div>\n\n\n\n<p>Retrouvez l\u2019ensemble des fiches \u201cAstrom\u00f4mes\u201d d\u00e9j\u00e0 parues en&nbsp;<a href=\"https:\/\/reperes-astro.fr\/category\/astromomes\/\">cliquant ici<\/a>.<\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_3016\" class=\"pvc_stats all  \" data-element-id=\"3016\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p><div class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>\u00a0La fiche ASTROMOMES COSMO 6 du 7 Janvier 2015 est disponible. Chaque mois ou bien lorsqu\u2019un \u00e9v\u00e8nement est observable par les&#46;&#46;&#46;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_3016\" class=\"pvc_stats all  \" data-element-id=\"3016\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":2,"featured_media":3022,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64],"tags":[],"class_list":["post-3016","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astromomes"],"yoast_head":"<title>FICHE ASTROMOMES COSMO 6 - 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