{"id":3712,"date":"2026-03-04T01:07:35","date_gmt":"2026-03-04T01:07:35","guid":{"rendered":"https:\/\/terrarara.com.br\/en\/?page_id=3712"},"modified":"2026-03-04T01:07:35","modified_gmt":"2026-03-04T01:07:35","slug":"galaxia-fantasma-quase-inteiramente-feita-de-materia-escura","status":"publish","type":"page","link":"https:\/\/terrarara.com.br\/en\/?page_id=3712","title":{"rendered":"Ghost galaxy almost entirely made of dark matter"},"content":{"rendered":"<div class=\"wp-block-image\"><figure><img decoding=\"async\" src=\"https:\/\/vendedoradesonhos.com.br\/upload\/1\/sites\/26\/img_41762_1200.jpg\" alt=\"\" style=\"width:100%\"><figcaption>The low-surface-brightness galaxy CDG-2, within the dashed red circle at right, is dominated by dark matter and contains only a sparse scattering of stars. The full image from NASA&#8221;s Hubble Space Telescope is at left. Credit: NASA, ESA, Dayi Li (UToronto); Image Processing: Joseph DePasquale (STScI)<\/figcaption><\/figure><\/div><hr><\/p><p>\r\n\t<a href=\"https:\/\/doi.org\/10.3847\/2041-8213\/adddab\" target=\"_blank\">doi.org\/10.3847\/2041-8213\/adddab<\/a><br><a href=\"https:\/\/vendedoradesonhos.com.br\/credibilidade_estudo.php?c=41762\">Credibility<\/a>: <font color=\"#00FFFF\">9<\/font><font color=\"#00FF00\">8<\/font><font color=\"#FFFF00\">9<\/font><br><a href='http:\/\/terrarara.com.br\/en\"s=dark matter'>#Dark Matter<\/a><\/p><p><\/p><p>\r\n\t<!-- audio --><\/p><p>\r\n<button onclick=\"this.nextElementSibling.play()\" style=\"padding:12px 25px; font-size:18px; border:none; border-radius:8px; cursor:pointer;\">Listen<\/button><audio src=\"https:\/\/vendedoradesonhos.com.br\/audios\/41762-eng.mp3\" preload=\"none\"><\/audio><\/p><p>\r\n\t<strong><\/p><p>\r\nAstronomers have just discovered one of the strangest and most mysterious galaxies ever found: a true &#8220;ghost galaxy&#8221; called CDG-2, located about 300 million light-years from Earth, within the famous Perseus galaxy cluster<\/strong><\/p><p><\/p><p>\r\nWhat makes this galaxy so special is the fact that it is composed almost entirely of dark matter.<\/p><p>\r\nAbout 99% of its total mass-considering both the visible and invisible parts-is dark matter, that mysterious substance that neither emits nor reflects light and that we can only detect through the gravitational effects it causes.\r\n<\/p><p>\r\nThe number of stars present in CDG-2 is so small that the total light it emits is equivalent to that of approximately 6 million stars similar to our Sun.<\/p><p>\r\nTo give you an idea, this is extremely weak for a galaxy.<\/p><p>\r\nFour globular clusters-those dense, spherical groups of ancient stars-are responsible for about 16% of this little visible light.<\/p><p>\r\nThese clusters were the main clue to finding the galaxy.<\/p><p>\r\nNormally, galaxies are discovered by the brightness of their stars or the gas they emit.<\/p><p>\r\nIn the case of CDG-2, astronomers used a different and clever method.<\/p><p>\r\nLed by David Li of the University of Toronto, they looked for statistical patterns in groups of globular clusters, as if following cosmic breadcrumbs.<\/p><p>\r\nThese clusters are more resistant and difficult to destroy, even when a galaxy undergoes strong gravitational interactions with its neighbors.<\/p><p>\r\nThis is probably exactly what happened: the larger galaxies in the Perseus cluster stripped hydrogen gas from CDG-2 over time.<\/p><p>\r\nWithout this gas, almost no new stars form, leaving the galaxy extremely faint and almost invisible.\r\n<\/p><p>\r\nTo confirm the discovery, the team used high-quality observations from powerful telescopes: NASA&#8217;s Hubble, the European Space Agency&#8217;s Euclid Space Telescope, and the Subaru Telescope in Hawaii.<\/p><p>\r\nThese images revealed a faint, diffuse glow around the four clusters, proving that a hidden galaxy truly exists there.\r\n<\/p><p>\r\nThis is the first time a galaxy has been detected solely by its population of globular clusters, without relying on the direct brightness of stars.<\/p><p>\r\nThe research, published in The Astrophysical Journal Letters in June 2025, paves the way for finding other similar objects in the universe.\r\n<\/p><p>\r\nDiscoveries like this help scientists better understand dark matter and how galaxies form and evolve in dense environments like clusters.<\/p><p>\r\nIn the future, even more advanced telescopes, such as NASA&#8217;s Nancy Grace Roman and the Vera C.<\/p><p>\r\nRubin Observatory, along with artificial intelligence techniques, should reveal many other phantom galaxies that have so far escaped our observations.\r\n<\/p><p>\r\n<blockquote class=\"twitter-tweet\" data-media-max-width=\"560\"><p lang=\"en\" dir=\"ltr\">??<br>Ghost galaxy almost entirely made of dark matter<a href=\"https:\/\/twitter.com\/hashtag\/DarkMatter'src=hash&amp;ref_src=twsrc%5Etfw\">#DarkMatter<\/a><br><br>Astronomers have just discovered one of the strangest and most mysterious galaxies ever found: a true &quot;ghost galaxy&quot; called CDG-2, located about 300 million light-years from Earth <a href=\"https:\/\/t.co\/ymDkNtzAXD\">pic.twitter.com\/ymDkNtzAXD<\/a><\/p>&mdash; Rare Earth (@rareearth0) <a href=\"https:\/\/twitter.com\/rareearth0\/status\/2029056268934025411?ref_src=twsrc%5Etfw\">March 4, 2026<\/a><\/blockquote> <script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script>\r\n<hr>\r\n\r\n<p style=\"text-align:right\"><em>Published in 03\/04\/2026 01h07<\/em><\/p>\r\n<hr>\r\n<p style=\"text-align:right\"><em><a href=\"https:\/\/terrarara.com.br\/?page_id=26591\">Portuguese version<\/a><\/em><\/p>\r\n<hr>\r\n\r\n\t\t<p>Text adapted by AI (Grok) and translated via Google API in the English version. Images from public image libraries or credits in the caption. Information about DOI, author and institution can be found in the body of the article.<\/p>\r\n\t\t<hr>\r\n\t\t<p>Reference article:<\/p>\r\n\t\t\r\n\t\t\r\n\r\n\r\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/scitechdaily.com\/ghost-galaxy-made-of-99-dark-matter-discovered-300-million-light-years-away\/\" target=\"_blank\">https:\/\/scitechdaily.com\/ghost-galaxy-made-of-99-dark-matter-discovered-300-million-light-years-away\/<\/a><\/li><\/ul>\r\n\r\n\r\n<p>Original study: <\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/doi.org\/10.3847\/2041-8213\/adddab\" target=\"_blank\">https:\/\/doi.org\/10.3847\/2041-8213\/adddab<\/a><\/li><\/ul>\r\n\r\n\r\n\r\n<hr class=\"wp-block-separator is-style-wide\"\/>\r\n\r\n<div style=\"position: buttonline;\"><iframe loading=\"lazy\" src=\"https:\/\/vendedoradesonhos.com.br\/rodape_sites.php?arg=41762\" frameborder=\"0\" height=\"420px\" width=\"100%\"><\/iframe><\/div>\r\n<div style=\"position: buttonline;\"><iframe loading=\"lazy\" src=\"https:\/\/vendedoradesonhos.com.br\/comentario_navegacao.php?arg=41762\" frameborder=\"0\" height=\"500px\" width=\"100%\"><\/iframe><\/div>\r\n<div style=\"position:absolute; width:40%; height:70px; top:-70px; left:0px;\"><iframe loading=\"lazy\" src=\"https:\/\/vendedoradesonhos.com.br\/oferta_site_esq.php?arg=41762\" frameborder=\"0\" height=\"100%\" width=\"100%\"><\/iframe><\/div>\r\n<div style=\"position:absolute; width:40%; height:70px; top:-70px; right:0px;\"><iframe loading=\"lazy\" src=\"https:\/\/vendedoradesonhos.com.br\/oferta_site_dir.php?arg=41762\" frameborder=\"0\" height=\"100%;\" width=\"100%\"><\/iframe><\/div>\r\n\r\n\r\n<div class=\"wp-block-image\"><figure><iframe loading=\"lazy\" src=\"https:\/\/vendedoradesonhos.com.br\/oferta_site_centralus.php\" width=\"100%\" height=\"330\" frameborder=\"0\"><\/iframe><figcaption>{teste}<\/figcaption><\/figure><\/div><hr>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":71,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3712","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=\/wp\/v2\/pages\/3712","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3712"}],"version-history":[{"count":0,"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=\/wp\/v2\/pages\/3712\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=\/wp\/v2\/pages\/71"}],"wp:attachment":[{"href":"https:\/\/terrarara.com.br\/en\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}