{"id":38,"date":"2022-05-24T22:39:09","date_gmt":"2022-05-24T20:39:09","guid":{"rendered":"http:\/\/actionsciencejargeau.fr\/?page_id=38"},"modified":"2022-07-14T19:35:12","modified_gmt":"2022-07-14T17:35:12","slug":"panneau3","status":"publish","type":"page","link":"https:\/\/actionsciencejargeau.fr\/index.php\/accueil\/cdu\/etape2\/panneau3\/","title":{"rendered":"Les trous noirs"},"content":{"rendered":"\n<div class=\"wp-block-group has-luminous-dusk-gradient-background has-background is-nowrap is-layout-flex wp-container-core-group-is-layout-ad2f72ca wp-block-group-is-layout-flex\">\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-8cf370e7 wp-block-group-is-layout-flex\">\n<figure class=\"wp-block-audio\"><audio controls src=\"http:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/Et2-3-1.mp3\"><\/audio><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"http:\/\/actionsciencejargeau.fr\/index.php\/accueil\/cdu\/etape2\/panneau2\/\">Pr\u00e9c\u00e9dent<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"http:\/\/actionsciencejargeau.fr\/index.php\/accueil\/cdu\/etape3\/panneau1\/\">Suivant<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"has-small-font-size\" id=\"block-1d2220c6-cb19-444c-baf5-b0467ddb587c\">On a vu que si une grosse \u00e9toile meurt, elle pourra donner naissance \u00e0 un trou noir.<\/p>\n\n\n\n<p class=\"has-small-font-size\" id=\"block-08014099-b820-44a8-bc6a-1b196e39a0c1\">Un trou noir est un endroit dans l&rsquo;espace o\u00f9 la gravit\u00e9 est tellement forte, que m\u00eame la lumi\u00e8re ne peut pas en sortir. La gravit\u00e9 est si forte parce que la mati\u00e8re a \u00e9t\u00e9 compress\u00e9e dans un espace minuscule. Cela peut arriver lorsqu&rsquo;une \u00e9toile meurt.<br>Parce qu&rsquo;aucune lumi\u00e8re ne peut sortir, on ne peut pas voir les trous noirs. Ils sont invisibles. Les t\u00e9lescopes spatiaux dot\u00e9s d&rsquo;outils sp\u00e9ciaux peuvent aider \u00e0 trouver des trous noirs. Ainsi on peut voir comment les \u00e9toiles qui sont tr\u00e8s proches des trous noirs agissent diff\u00e9remment des autres \u00e9toiles.<\/p>\n\n\n\n<p class=\"has-small-font-size\" id=\"block-6c054586-c0ee-4438-8fdb-fb6d07957a01\">Un soir, rep\u00e9rez vous dans le ciel et rechercher la constellation du sagittaire, au bout de la voie lact\u00e9e. Regardez bien, c\u2019est l\u00e0 que se trouve le trou noir de notre galaxie, regardez bien, on ne peut pas le voir\u2026<\/p>\n\n\n\n<p class=\"has-small-font-size\" id=\"block-9af49c66-6cd3-45e1-a6ae-ce420d23a219\">Sur le site de l\u2019Eso.org vous pourrez d\u00e9couvrir de superbes images prises par les t\u00e9lescopes et offertes au public&nbsp;; c\u2019est une invitation au r\u00eave.<\/p>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"453\" height=\"855\" src=\"http:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/image-43.png\" alt=\"\" class=\"wp-image-350\" srcset=\"https:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/image-43.png 453w, https:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/image-43-159x300.png 159w\" sizes=\"(max-width: 453px) 100vw, 453px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-columns alignwide has-luminous-dusk-gradient-background has-background 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:59%\">\n<div class=\"wp-block-group\" style=\"padding-top:2em;padding-right:2em;padding-bottom:2em;padding-left:2em\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-text-align-center\" style=\"font-size:36px;line-height:1.2\">Un trou noir&#8230;<\/p>\n\n\n\n<p>On en entend parler, on en a d\u00e9tect\u00e9&#8230; mais qu&rsquo;est-ce que c&rsquo;est ?<\/p>\n\n\n\n<p>Encore une fois, Henry va nous l&rsquo;expliquer<\/p>\n\n\n\n<figure class=\"wp-block-audio\"><audio controls src=\"http:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/Et2-3.mp3\"><\/audio><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"http:\/\/actionsciencejargeau.fr\/index.php\/accueil\/cdu\/etape2\/panneau2\/\">pr\u00e9c\u00e9dent<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"http:\/\/actionsciencejargeau.fr\/index.php\/accueil\/cdu\/etape3\/panneau1\/\">suivant<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<figure class=\"wp-block-image size-full is-style-rounded\"><img decoding=\"async\" width=\"700\" height=\"684\" src=\"http:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/potw2102a.jpg\" alt=\"\" class=\"wp-image-153\" srcset=\"https:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/potw2102a.jpg 700w, https:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/potw2102a-300x293.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption>Captured with the MUSE instrument on ESO\u2019s Very Large Telescope (VLT), this image of the distant spiral galaxy NGC 1097 shows a textbook example of a star-bursting nuclear ring. Located 45 million light-years away from Earth, in the constellation of Fornax, this ring lies at the very centre of its galaxy. It spans only 5,000 light years across, being dwarfed by the full size of its host galaxy, which extends some tens of thousands of light-years beyond its centre. The darker lanes seen in this MUSE image show dust, gas and debris from the galaxy (or possibly from a satellite galaxy), which are being funnelled into the supermassive black hole at its centre. This process heats up the surrounding matter forming an accretion disc around the black hole and launching huge amounts of energy into the surrounding area. Nearby dust is heated up and star formation accelerates in the area around the supermassive black hole, forming the star-bursting nuclear ring shown in pink and purple tones in the image. MUSE, which stands for Multi Unit Spectroscopic Explorer, is attached to Yepun, one of the four, 8.2-metre telescopes that make up the VLT at ESO\u2019s Paranal Observatory. Its unique design has allowed researchers to map complex mechanisms within many galaxies and analyse the formation of stars and star clusters.<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:41%\">\n<figure class=\"wp-block-image size-full is-style-rounded\"><img decoding=\"async\" width=\"700\" height=\"700\" src=\"http:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/eso2208-eht-mwa.jpg\" alt=\"\" class=\"wp-image-152\" srcset=\"https:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/eso2208-eht-mwa.jpg 700w, https:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/eso2208-eht-mwa-300x300.jpg 300w, https:\/\/actionsciencejargeau.fr\/wp-content\/uploads\/2022\/07\/eso2208-eht-mwa-150x150.jpg 150w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption>This is the first image of Sgr A*, the supermassive black hole at the centre of our galaxy. It\u2019s the first direct visual evidence of the presence of this black hole. It was captured by the Event Horizon Telescope (EHT), an array which linked together eight existing radio observatories across the planet to form a single \u201cEarth-sized\u201d virtual telescope. The telescope is named after the event horizon, the boundary of the black hole beyond which no light can escape.&nbsp;&nbsp; Although we cannot see the event horizon itself, because it cannot emit light, glowing gas orbiting around the black hole reveals a telltale signature: a dark central region (called a shadow) surrounded by a bright ring-like structure. The new view captures light bent by the powerful gravity of the black hole, which is four million times more massive than our Sun. The image of the Sgr A* black hole is an average of the different images the EHT Collaboration has extracted from its 2017 observations.&nbsp; In addition to other facilities, the EHT network of radio observatories that made this image possible includes the Atacama Large Millimeter\/submillimeter Array (ALMA) and the Atacama Pathfinder EXperiment (APEX) in the Atacama Desert in Chile, co-owned and co-operated by ESO is a partner on behalf of its member states in Europe.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-small-font-size\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>On a vu que si une grosse \u00e9toile meurt, elle pourra donner naissance \u00e0 un trou noir. Un trou noir est un endroit dans l&rsquo;espace o\u00f9 la gravit\u00e9 est tellement [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":29,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-38","page","type-page","status-publish","hentry","entry"],"_links":{"self":[{"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/pages\/38","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/comments?post=38"}],"version-history":[{"count":4,"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/pages\/38\/revisions"}],"predecessor-version":[{"id":351,"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/pages\/38\/revisions\/351"}],"up":[{"embeddable":true,"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/pages\/29"}],"wp:attachment":[{"href":"https:\/\/actionsciencejargeau.fr\/index.php\/wp-json\/wp\/v2\/media?parent=38"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}