{"id":1031,"date":"2025-11-06T00:05:29","date_gmt":"2025-11-06T00:05:29","guid":{"rendered":"https:\/\/focus-pacific.com\/?p=1031"},"modified":"2025-04-23T15:29:42","modified_gmt":"2025-04-23T15:29:42","slug":"chinas-dark-matter-space-probe-detects-tantalizing-signal","status":"publish","type":"post","link":"https:\/\/focus-pacific.com\/?p=1031","title":{"rendered":"China\u2019s dark matter space probe detects tantalizing signal"},"content":{"rendered":"<p><strong>China\u2019s dark matter space probe detects tantalizing signal<\/strong><\/p>\n<p>A long-standing challenge in physics has been finding evidence for dark matter, the stuff presumed to make up a substantial chunk of the mass of the universe. Its existence seems to be responsible for the structure of the universe and the formation and evolution of galaxies. But physicists have yet to observe this mysterious material. Results reported today by a China-led space science mission provide a tantalizing hint for dark matter. Perhaps more significantly, the first observational data produced by China\u2019s first mission dedicated to astrophysics shows that the country is set to become a force in space science, says David Spergel, an astrophysicist at Princeton University. China is now &#8220;making significant contributions to astrophysics and space science,&#8221; he says.<\/p>\n<p><a href=\"http:\/\/focuspacific.com\/wp-content\/uploads\/2018\/02\/catherine-article-photo.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1462\" src=\"http:\/\/focuspacific.com\/wp-content\/uploads\/2018\/02\/catherine-article-photo-300x185.jpg\" alt=\"\" width=\"300\" height=\"185\" \/><\/a><\/p>\n<p>Physicists have inferred the existence of dark matter from its gravitational effect on visible matter. China\u2019s Dark Matter Particle Explorer (DAMPE) was designed to try to fill that gap, by looking for an indirect decay signal of a hypothetical dark matter candidate called weakly interacting massive particles (WIMPs). Researchers launched the spacecraft from the Jiuquan Satellite Launch Center in the Gobi Desert, about 1600 kilometers west of Beijing, in December 2015. Its primary instrument\u2014a stack of thin, crisscrossed detector strips\u2014is tuned to observe the incoming direction, energy, and electric charge of the particles that make up cosmic rays, particularly electrons and positrons, the antimatter counterparts of electrons. Cosmic rays emanate from conventional astrophysical objects, like exploding supernovae in the galaxy. But if dark matter consists of WIMPs, these would occasionally annihilate each other and create electron-positron pairs, which might be detected as an excess over the expected abundance of particles from conventional objects.<\/p>\n<p>In its first 530 days of scientific observations, DAMPE detected 1.5 million cosmic ray electrons and positrons above a certain energy threshold. When researchers plot of the number of particles against their energy, they\u2019d expect to see a smooth curve. But previous experiments have hinted at an anomalous break in the curve. Now, DAMPE has confirmed that deviation. The\u00a0<a href=\"http:\/\/nature.com\/articles\/doi:10.1038\/nature2447\"><strong>DAMPE results appear online today<\/strong><\/a>\u00a0in\u00a0Nature. More data will be needed to confirm what DAMPE is possibly seeing. But there is good news on that front.<\/p>\n<p>Ruoci Ning<\/p>\n","protected":false},"excerpt":{"rendered":"<p>China\u2019s dark matter space probe detects tantalizing signal A long-standing challenge in physics has been finding evidence for dark matter, the stuff presumed to make up a substantial chunk of the mass of the universe. Its existence seems to be responsible for the structure of the universe and the formation and evolution of galaxies. But [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[1],"tags":[],"class_list":["post-1031","post","type-post","status-publish","format-standard","hentry","category-soc"],"_links":{"self":[{"href":"https:\/\/focus-pacific.com\/index.php?rest_route=\/wp\/v2\/posts\/1031","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/focus-pacific.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/focus-pacific.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/focus-pacific.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/focus-pacific.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1031"}],"version-history":[{"count":1,"href":"https:\/\/focus-pacific.com\/index.php?rest_route=\/wp\/v2\/posts\/1031\/revisions"}],"predecessor-version":[{"id":1032,"href":"https:\/\/focus-pacific.com\/index.php?rest_route=\/wp\/v2\/posts\/1031\/revisions\/1032"}],"wp:attachment":[{"href":"https:\/\/focus-pacific.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1031"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/focus-pacific.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1031"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/focus-pacific.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1031"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}