{"id":285082,"date":"2025-04-18T18:15:34","date_gmt":"2025-04-18T18:15:34","guid":{"rendered":"https:\/\/news.talkwithrattan.com\/index.php\/2025\/04\/18\/a-gas-clump-in-the-milky-ways-neighborhood-might-be-a-dark-galaxy\/"},"modified":"2025-04-18T18:15:34","modified_gmt":"2025-04-18T18:15:34","slug":"a-gas-clump-in-the-milky-ways-neighborhood-might-be-a-dark-galaxy","status":"publish","type":"post","link":"https:\/\/news.talkwithrattan.com\/index.php\/2025\/04\/18\/a-gas-clump-in-the-milky-ways-neighborhood-might-be-a-dark-galaxy\/","title":{"rendered":"A gas clump in the Milky Way\u2019s neighborhood might be a \u2018dark galaxy\u2019"},"content":{"rendered":"<div style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.sciencenews.org\/wp-content\/uploads\/2025\/04\/041825_mg-h_dark-galaxy_feat.jpg?fit=800%2C450&amp;ssl=1\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"A gas clump in the Milky Way\u2019s neighborhood might be a \u2018dark galaxy\u2019\" title=\"A gas clump in the Milky Way\u2019s neighborhood might be a \u2018dark galaxy\u2019\" \/><\/div> \r\n<br><br><div data-component=\"video-embed\">\n\t\t\t\t\n\n\n\n\n<p>A potential dark galaxy \u2014 one made primarily of dark matter \u2014 may have been spotted in the local universe.<\/p>\n\n\n\n<p>Dark galaxies are theoretical, starless systems whose discovery could help astronomers better understand galaxy formation. The new candidate was found within a large, fast-moving cloud of gas first seen in the 1960s. High-resolution observations of the cloud, reported April 18 in <em>Science Advances<\/em>, revealed <a href=\"https:\/\/doi.org\/10.1126\/sciadv.ads4057\" target=\"_blank\" rel=\"noreferrer noopener\">a compact clump of gas that might be a dark galaxy<\/a>.<\/p>\n\n\n<aside class=\"sn-conversion rich-text rich-text--with-sidebar\">\n<style><![CDATA[\n.email-conversion {\n  border: 1px solid #ffcccb;\n  color: white;\n  margin-top: 50px;\n  background-image: url(\"\/wp-content\/themes\/sciencenews\/client\/src\/images\/cta-module@2x.jpg\");\n  padding: 20px;\n  clear: both;\n}\n\n]]><\/style>\n\n\n\n<style class=\"is-layout-flow wp-block-group-is-layout-flow\"><![CDATA[#newsletter-helper svg {\n    width: auto;\n    fill: #f1563e;\n}\n\n#newsletter-helper {\n    display: flex;\n    border-top: 1px solid gray;\n    padding-top: 10px;\n    padding-left: 20px;\n    margin-bottom: 10px;\n    max-width: 900px; \n    margin: auto\n}\n\n.zephr-form-container {\n    border-bottom: 1px solid gray;\n    margin: 0px !important;\n}\n]]><\/style><div id=\"newsletter-helper\">\n  <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" enable-background=\"new 0 0 122.88 78.607\" height=\"25\" viewbox=\"0 0 122.88 78.607\" width=\"30\"><path clip-rule=\"evenodd\" d=\"m61.058 65.992 24.224-24.221 36.837 36.836h-48.446-25.23-48.443l36.836-36.836zm-59.657-65.992 59.656 59.654 59.657-59.654zm-1.401 69.673 31.625-31.628-31.625-31.625zm122.88 3.025-34.653-34.653 34.653-34.652z\" fill-rule=\"evenodd\"\/><\/svg>\n  <h3 style=\"margin-left: 10px; margin-top:2px; margin-bottom:0px;\">Sign up for our newsletter<\/h3>\n<\/div>\n<p style=\"padding-left: 20px; margin: 0px; max-width: 900px; margin: auto\">We summarize the week&#8217;s scientific breakthroughs every Thursday.<\/p>                        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var(--zephr-input-borderColor);--zf-payment-options-borderRadius:calc(var(--zephr-input-borderRadius) * 1px);--zf-payment-options-highlighted-color:var(--zephr-color-text-main);--zf-payment-options-highlighted-bgColor:var(--zephr-color-accent-main);--zf-payment-summary-fontSize:var(--zf-subtext-fontSize);--zf-payment-summary-color:var(--zephr-color-text-main);--zf-payment-summary-bgColor:var(--zf-input-bgColor);--zf-payment-summary-border:calc(var(--zephr-input-borderWidth) * 1px) solid var(--zephr-input-borderColor);--zf-payment-summary-borderRadius:calc(var(--zephr-input-borderRadius) * 1px);--zf-list-subscriptions-container-maxWidth:630px;--zf-list-subscriptions-container-padding:24px;--zf-list-subscriptions-section-padding:16px 0px;--zf-list-subscriptions-container-border:calc(var(--zephr-input-borderWidth) * 1px) solid var(--zephr-input-borderColor);--zf-list-subscriptions-container-borderRadius:calc(var(--zephr-input-borderRadius) * 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!important;\n}\n\n.zephr-form {\n    margin: 0px !important;\n    overflow-clip-margin: content-box;\n    --zf-container-bgColor: none;\n    --zf-container-maxWidth: 900px;\n}\n\n.zephr-form h3 {\n    font-size: 1.2rem;\n    font-weight: bold;\n    color: #f1563e;\n    margin-top: 0px;\n}\n\n.zephr-form p {\n    text-align: center;\n    margin: 0px;\n    color: #2b3136;\n    font-size: 1rem;\n}]]><\/style>\n                        \n                        \n<\/aside>\n\n\n<p>\u201cThis is the first discovery of a potential dark galaxy in the nearby universe,\u201d says astronomer Jin-Long Xu of the Chinese Academy of Sciences in Beijing.<\/p>\n\n\n\n<p>Not all astronomers agree. The clump\u2019s classification as a dark galaxy is plausible, says astronomer Tobias Westmeier, but he finds the evidence lacking. Instead of a relatively distant dark galaxy, Westmeier thinks the object is more likely a regular gas cloud at the edge of the Milky Way.<\/p>\n\n\n\n<p>\u201cI\u2019m very skeptical about the claims that they\u2019re making in the paper for a number of reasons,\u201d says Westmeier, of the University of Western Australia in Crawley. \u201cThere\u2019s no convincing evidence.\u201d<\/p>\n\n\n\n<p>Since the early 2000s, a handful of <a href=\"https:\/\/www.sciencenews.org\/article\/ghostly-galaxy-massive-dark-cloud-intrigues-scientists\">candidate dark galaxies<\/a> have been discovered around the Milky Way. But in most cases, further observations revealed the alleged dark galaxies to be misclassified. Many turned out to have a small population of faint stars that were initially overlooked. So far, none of the candidates have proved to be truly dark.<\/p>\n\n\n\n<p>\u201cPeople have been trying to find these starless galaxies for many years and so far without much success,\u201d Westmeier says.<\/p>\n\n\n\n<p>The new results were compiled from observations using three radio telescopes, including high-resolution images from the Five-hundred-meter Aperture Spherical Telescope in southern China. In addition to <a href=\"https:\/\/www.sciencenews.org\/article\/vera-rubin-biography-ashley-yeager-dark-matter-cosmology\">dark matter<\/a>, dark galaxies contain hydrogen gas, which can be observed <a href=\"https:\/\/www.sciencenews.org\/article\/radio-astronomy-history-cosmos-black-hole-planet-universe\">at radio wavelengths<\/a>. Additional observations at visible wavelengths from two stellar surveys suggest that the clump is starless.<\/p>\n\n\n\n<p>Analysis of the radio telescope data allowed the researchers to determine the speed and direction of hydrogen gas in different parts of the clump. The data were also used to indirectly measure the distance to the clump, which the team estimated to be 900,000 light-years from Earth. Rotational movement seen in the clump\u2019s gas suggests it could be a disk galaxy, rather than a clump of ordinary gas.<\/p>\n\n\n\n<p>\u201cThe most [exciting] part is the finding of the rotating disk structure,\u201d says study coauthor Ming Zhu, an astronomer also at the Chinese Academy of Sciences.<\/p>\n\n\n\n<p>But Westmeier notes that if the distance measurement is wrong, this rotational signature could indicate the clump is just a gas cloud falling into the Milky Way. Zhu agrees that a more accurate distance estimate and higher resolution data of the disk\u2019s rotation are necessary to confirm the candidate as a dark galaxy.<\/p>\n\n\n\n<p>Many astronomers theorize that dark galaxies are building blocks of <a href=\"https:\/\/www.sciencenews.org\/article\/spiral-galaxies-lentil-shaped-star\">larger galaxies<\/a>. As dark galaxies collide with star-studded ones, their extra gas promotes more star formation. Dark galaxies are also thought to form from regular galaxies stripped of their stars following a collision or interaction. The new study\u2019s team thinks that the new potential dark galaxy formed in this way after colliding with intergalactic gas in our galactic neighborhood.<\/p>\n\n\n<aside class=\"sn-conversion rich-text rich-text--with-sidebar\">\n<p class=\"has-text-align-center wp-elements-27c40654034fbeecef6418d6adfe0794\" style=\"color:gray; margin-bottom:0px; font-size:.9rem;\">Sponsor Message<\/p>\n<!-- Tag ID: sciencenews-org_leaderboard_incontent -->\n\n<\/aside>\n\n\n<p>Ultimately, finding dark galaxies could help astronomers refine computer simulations to better understand how galaxies form and evolve. Studying the shape of these galaxies could also refine astronomers\u2019 understanding about what dark matter is made of.<\/p>\n\n\n\n<p>\u201cDark galaxies are the most primitive state of a general galaxy formation,\u201d Xu says. Their discovery, he says, can help confirm whether galaxy formation starts with dark galaxies.<\/p>\n\n\n\n\t\t\t<\/div>\r\n<br>\r\n<br><a href=\"https:\/\/www.sciencenews.org\/article\/gas-clump-milky-way-dark-galaxy\">Source link <\/a>","protected":false},"excerpt":{"rendered":"<p>A potential dark galaxy \u2014 one made primarily of dark matter \u2014 may have been spotted in the local universe. Dark galaxies are theoretical, starless systems whose discovery could help astronomers better understand galaxy formation. The new candidate was found within a large, fast-moving cloud of gas first seen in the 1960s. High-resolution observations of [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":285083,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"tdm_status":"","tdm_grid_status":"","fifu_image_url":"https:\/\/i0.wp.com\/www.sciencenews.org\/wp-content\/uploads\/2025\/04\/041825_mg-h_dark-galaxy_feat.jpg?fit=800%2C450&ssl=1","fifu_image_alt":"","footnotes":""},"categories":[606],"tags":[221354,1866,2845,170,9893,40540,4355],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts\/285082"}],"collection":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/comments?post=285082"}],"version-history":[{"count":1,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts\/285082\/revisions"}],"predecessor-version":[{"id":285084,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/posts\/285082\/revisions\/285084"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/media\/285083"}],"wp:attachment":[{"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/media?parent=285082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/categories?post=285082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news.talkwithrattan.com\/index.php\/wp-json\/wp\/v2\/tags?post=285082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}