{"version":"1.0","provider_name":"AFRIK Management","provider_url":"https:\/\/afrikmanagement.com","author_name":"admin","author_url":"https:\/\/afrikmanagement.com\/index.php\/author\/wxrmg2xuqd\/","title":"\u00c9toile \u00e0 Neutrons : qu'est-ce que c'est ? - AFRIK Management","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"fLGsyGAnhZ\"><a href=\"https:\/\/afrikmanagement.com\/index.php\/2023\/09\/28\/etoile-a-neutrons-quest-ce-que-cest\/\">\u00c9toile \u00e0 Neutrons : qu&#8217;est-ce que c&#8217;est ?<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/afrikmanagement.com\/index.php\/2023\/09\/28\/etoile-a-neutrons-quest-ce-que-cest\/embed\/#?secret=fLGsyGAnhZ\" width=\"600\" height=\"338\" title=\"\u00ab\u00a0\u00c9toile \u00e0 Neutrons : qu&#8217;est-ce que c&#8217;est ?\u00a0\u00bb &#8212; AFRIK Management\" data-secret=\"fLGsyGAnhZ\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/* <![CDATA[ *\/\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/afrikmanagement.com\/wp-includes\/js\/wp-embed.min.js\n\/* ]]> *\/\n<\/script>\n","thumbnail_url":"https:\/\/afrikmanagement.com\/wp-content\/uploads\/2023\/09\/magnetar_ESO-L.-Calcada.webp","thumbnail_width":1520,"thumbnail_height":950,"description":"Les\u00a0\u00e9toiles\u00a0\u00e0\u00a0neutrons\u00a0sont le r\u00e9sidu de l&#8217;effondrement\u00a0gravitationnel d&#8217;une partie de la\u00a0mati\u00e8re\u00a0d&#8217;une \u00e9toile massive en fin de vie et explosant en\u00a0supernova\u00a0de type\u00a0SN\u00a0II. Il faut pour cela que sa\u00a0masse\u00a0d\u00e9passe les 8 \u00e0 10 masses solaires. Dans les grandes lignes, l&#8217;effondrement de la partie de l&#8217;\u00e9toile qui n&#8217;est pas souffl\u00e9e par l&#8217;explosion, principalement son c\u0153ur de fer, conduit les protons et les\u00a0\u00e9lectrons\u00a0\u00e0 se combiner pour se transformer en neutrons et cela produit du m\u00eame coup un flux de\u00a0neutrinos\u00a0tr\u00e8s \u00e9nerg\u00e9tiques.\u00a0On obtient alors des\u00a0astres\u00a0qui peuvent contenir toute la masse du Soleil dans une sph\u00e8re de quelques dizaines de kilom\u00e8tres de diam\u00e8tre seulement et qui est une sorte [&hellip;]"}