{"id":575657,"date":"2026-01-27T15:26:03","date_gmt":"2026-01-27T18:26:03","guid":{"rendered":"https:\/\/revistapesquisa.fapesp.br\/?p=575657"},"modified":"2026-01-27T15:26:03","modified_gmt":"2026-01-27T18:26:03","slug":"details-of-a-stars-death","status":"publish","type":"post","link":"https:\/\/revistapesquisa.fapesp.br\/en\/details-of-a-stars-death\/","title":{"rendered":"Details of a star\u2019s death"},"content":{"rendered":"<p>Roughly 11,300 years ago, a massive star was at the end of its life, its energy fluctuating as it expelled material from its outer layers. Then it exploded and formed the supernova remnant Cassiopeia A (Cas A). Using the Chandra X-ray telescope, an international team of astronomers discovered that the progenitor star of Cas A had between 15 and 20 solar masses, was likely a red supergiant, and exploded when its core collapsed. \u201cShortly before the star collapsed, part of an inner layer rich in silicon broke apart and mixed with a neighboring layer containing large amounts of neon [a chemical element capable of emitting a characteristic reddish-orange light],\u201d Kai Matsunaga of Kyoto University, Japan, told <em>Astronomy Today<\/em>. Neon burns as it is pulled inward and silicon is transported out of the star, indicating that the final burning process rapidly altered the star\u2019s internal structure. The light from Cas A&#8217;s explosion reached Earth around the year 1660 (<a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/1538-4357\/aded14#apjaded14s5\" target=\"_blank\" rel=\"noopener\"><em>Astrophysical Journal<\/em><\/a>, September 2).<\/p>\n<picture data-tablet=\"\/wp-content\/uploads\/2026\/01\/RPF-notas-2025-10-info-ING-DESK.jpg\" data-tablet_size=\"1140x1225\" alt=\"Remnants of a star explosion in Cassiopeia A: sulfur (yellow), calcium (green), iron (purple), and X-rays (light blue)\">\n    <source srcset=\"\/wp-content\/uploads\/2026\/01\/RPF-notas-2025-10-info-ING-DESK.jpg\" media=\"(min-width: 1920px)\" \/>\n    <source srcset=\"\/wp-content\/uploads\/2026\/01\/RPF-notas-2025-10-info-ING-DESK.jpg\" media=\"(min-width: 1140px)\" \/>\n    <img decoding=\"async\" class=\"responsive-img\" src=\"\/wp-content\/uploads\/2026\/01\/RPF-notas-2025-10-info-ING-MOBILE.jpg\" \/>\n  <\/picture><span class=\"embed media-credits-inline\">NASA \/ CXC \/ Meiji University <\/span>\n","protected":false},"excerpt":{"rendered":"Astronomers discover how a star dies","protected":false},"author":475,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[1651],"tags":[205,235],"coauthors":[785],"class_list":["post-575657","post","type-post","status-publish","format-standard","hentry","category-notes","tag-astronomy","tag-physics"],"acf":[],"_links":{"self":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/575657","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/users\/475"}],"replies":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/comments?post=575657"}],"version-history":[{"count":4,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/575657\/revisions"}],"predecessor-version":[{"id":577464,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/575657\/revisions\/577464"}],"wp:attachment":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/media?parent=575657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/categories?post=575657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/tags?post=575657"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/coauthors?post=575657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}