{"id":3093,"date":"2015-01-20T13:46:55","date_gmt":"2015-01-20T12:46:55","guid":{"rendered":"http:\/\/reperes-astro.fr\/?p=3093"},"modified":"2025-01-07T17:10:54","modified_gmt":"2025-01-07T16:10:54","slug":"fiche-astromomes-cosmo-7","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/fiche-astromomes-cosmo-7\/","title":{"rendered":"FICHE ASTROMOMES COSMO 7"},"content":{"rendered":"\n<p>\u00a0La fiche ASTROMOMES COSMO 7 du 20 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\">Qu\u2019est ce qui a amen\u00e9 les astronomes \u00e0 imaginer le BIG BANG\u00a0?<\/h2>\n\n\n\n<p>C\u2019est d\u2019abord HUBBLE Edwin qui mesure la distance qui nous s\u00e9pare de la n\u00e9buleuse d\u2019ANDROMEDE.<\/p>\n\n\n\n<p>Elle serait, d\u2019apr\u00e8s lui, \u00e0 1&nbsp;500&nbsp;000 AL (ann\u00e9e lumi\u00e8re). Elle n\u2019est donc pas \u00e0 l\u2019int\u00e9rieur de notre galaxie&nbsp;: la VOIE LACTEE dont le diam\u00e8tre est de 100&nbsp;000 AL\u2026<\/p>\n\n\n\n<p>C\u2019est une autre galaxie&nbsp;!<\/p>\n\n\n\n<p>Notre UNIVERS, limit\u00e9 auparavant \u00e0 notre galaxie, prend alors une autre dimension.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comment HUBBLE peut-il trouver cette distance\u00a0?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>1\/. Il a avant tout eu la chance d\u2019utiliser le meilleur t\u00e9lescope du monde \u00e0 cette \u00e9poque.<\/strong><\/h3>\n\n\n\n<p>C\u2019est le t\u00e9lescope HOOKER situ\u00e9 au mont WILSON (USA), son miroir a un diam\u00e8tre de 2,50m ce qui est \u00e9norme pour l\u2019\u00e9poque, il a \u00e9t\u00e9 mis en service en 1917.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/index.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"151\" height=\"90\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/index.jpg\" alt=\"FICHE ASTROMOMES COSMO 7\" class=\"wp-image-3098\" title=\"index\"\/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/200px-100inchHooker.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"326\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/200px-100inchHooker.jpg\" alt=\"FICHE ASTROMOMES COSMO 7\" class=\"wp-image-3099\" title=\"200px-100inchHooker\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/200px-100inchHooker.jpg 200w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/200px-100inchHooker-184x300.jpg 184w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>2\/. Il a surtout b\u00e9n\u00e9fici\u00e9 des travaux d\u2019une astronome\u00a0: Henrietta LEVIT.<\/strong><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/Astronomer_Edward_Charles_Pickerings_Harvard_computers.jpg\" alt=\"\" style=\"width:630px\"\/><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>La photo ci-dessus montre H Leavitt avec ses coll\u00e8gues f\u00e9minines en train de d\u00e9cripter les plaques photos qui s\u2019accumulaient \u00e0 l\u2019observatoire.<\/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\/Leavitt_aavso.jpg\" alt=\"\"\/><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Henrietta Leavitt, dans les ann\u00e9es 1910-1920, \u00e9tudie les \u00e9toiles variables et plus particuli\u00e8rement les <strong>c\u00e9ph\u00e9ides.<\/strong><\/p>\n\n\n\n<p><strong><em>Une c\u00e9ph\u00e9ide<\/em><\/strong><em> est une \u00e9toile variable, g\u00e9ante ou superg\u00e9ante jaune, de 4 \u00e0 15 fois plus massive que le Soleil et de 100 \u00e0 30 000 fois plus lumineuse, dont l&rsquo;\u00e9clat varie selon une p\u00e9riode bien d\u00e9finie, comprise entre 1 et 135 jours, d&rsquo;o\u00f9 elle tire son nom d&rsquo;\u00e9toile variable. <\/em><\/p>\n\n\n\n<p>Elle s&rsquo;aper\u00e7oit que les <strong>p\u00e9riodes <\/strong>des c\u00e9ph\u00e9ides sont d&rsquo;autant plus grandes que celles-ci sont <strong>brillantes.<\/strong><\/p>\n\n\n\n<p>Elle a r\u00e9ussi \u00e0 calculer la distance et la luminosit\u00e9 d&rsquo;une de ces c\u00e9ph\u00e9ides dans les Nuages de Magellan.<\/p>\n\n\n\n<p>L\u2019\u00e9clat de cette c\u00e9ph\u00e9ide va servir de mesure \u00ab\u00a0\u00e9talon\u00a0\u00bb pour d\u00e9terminer la distance de n&rsquo;importe quelle autre c\u00e9ph\u00e9ide semblable (ayant la m\u00eame p\u00e9riode) observ\u00e9e \u00e0 plus grande distance.\u00a0<\/p>\n\n\n\n<p><strong>C\u2019est ainsi que Hubble d\u00e9termine la distance d\u2019une c\u00e9ph\u00e9ide qu\u2019il peut observer dans la n\u00e9buleuse d\u2019ANDROMEDE gr\u00e2ce aux performances de son instrument.<\/strong><\/p>\n\n\n\n<p>Ensuite, Hubble d\u00e9couvre de plus en plus de galaxies, de plus en plus lointaines, l\u2019univers s\u2019agrandit tr\u00e8s vite car les instruments et les observateurs deviennent de plus en plus performants\u2026\u00a0<\/p>\n\n\n\n<p>HUBBLE s\u2019aper\u00e7oit alors que toutes les galaxies qu\u2019il observe s\u2019\u00e9loignent entres elles et donc aussi de nous \u00e0 des vitesses diff\u00e9rentes. L\u2019univers qu\u2019il observe semble en expansion selon une loi math\u00e9matique nomm\u00e9e loi de Hubble\u2026<\/p>\n\n\n\n<p>En fait, un abb\u00e9 Belge, Georges LEMAITRE, a fait le m\u00eame constat deux ans avant mais son article, \u00e9crit en fran\u00e7ais, n\u2019a pas eu le retentissement qu\u2019il m\u00e9ritait.\u00a0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">COMMENT HUBBLE PEUT-IL MESURER LES VITESSES DE FUITE DES GALAXIES\u00a0?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Gr\u00e2ce \u00e0 l\u2019EFFET DOPPLER\u2026<\/strong><\/h3>\n\n\n\n<p>Le dessin ci-dessous doit vous rappeler quelque chose que vous avez d\u00e9j\u00e0 entendu. Imaginons que cette voiture est une ambulance ou une formule 1. Quand elle s\u2019approche de votre oreille, les ondes sonores sont compress\u00e9es et le son devient aigu. Au contraire quand la voiture vous a d\u00e9pass\u00e9, les ondes sonores sont d\u00e9compress\u00e9es et le son devient plus grave.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/420943.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"333\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/420943.jpg\" alt=\"\" class=\"wp-image-3104\" title=\"420943\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/420943.jpg 640w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/01\/420943-300x156.jpg 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Sur le croquis cidessous le ph\u00e9nom\u00e8ne s\u2019applique de la m\u00eame mani\u00e8re aux ondes lumineuses\u2026Plus la source lumineuse s\u2019\u00e9loigne rapidement plus elle est d\u00e9vi\u00e9e vers le rouge. Les astronomes appellent \u00e7a le REDSHFT\u2026<\/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\/doppler-raie-spectrale.png\" alt=\"\"\/><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>A ce moment, on peut affirmer que tout l\u2019univers est en expansion\u00a0!<\/p>\n\n\n\n<p><strong>Mais comment arriver \u00e0 la th\u00e9orie du BIG BANG\u00a0?\u00a0\u00a0\u00a0 voir la fiche suivante\u2026<\/strong><\/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<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_3093\" class=\"pvc_stats all  \" data-element-id=\"3093\" 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 7 du 20 Janvier 2015 est disponible. 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