{"id":135218,"date":"2024-12-09T21:42:51","date_gmt":"2024-12-09T14:42:51","guid":{"rendered":"https:\/\/hotvideos24.online\/?p=135218"},"modified":"2024-12-09T21:42:51","modified_gmt":"2024-12-09T14:42:51","slug":"latest-james-webb-data-hints-at-new-physics-in-universes-expansion","status":"publish","type":"post","link":"https:\/\/hotvideos24.online\/?p=135218","title":{"rendered":"Latest James Webb data hints at new physics in Universe\u2019s expansion"},"content":{"rendered":"<p> <script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<\/p>\n<div>\n<p>Earlier this year, JWST researchers <a href=\"https:\/\/arstechnica.com\/science\/2024\/03\/latest-webb-space-telescope-data-confirms-hubbles-value-for-expansion-of-universe\/\">reported on measurements<\/a> built on <a href=\"https:\/\/webbtelescope.org\/contents\/early-highlights\/webb-confirms-accuracy-of-universes-expansion-rate-measured-by-hubble\">last year&#8217;s confirmation<\/a> based on Webb data that Hubble&#8217;s measurements of the expansion rate were accurate, at least for the first few &#8220;rungs&#8221; of the &#8220;cosmic distance ladder.&#8221; But there was still the possibility of as-yet-undetected errors that might increase the deeper (and hence further back in time) one looked into the Universe, particularly for brightness measurements of more distant stars.<\/p>\n<figure class=\"ars-wp-img-shortcode id-2065607 align-none\">\n<div>\n                        <img width=\"640\" height=\"251\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/12\/hubble2-640x251.jpg\" class=\"none medium\" alt=\"Three views of NGC 4258 (Messier 106). The left and center images show the galaxy in visible light, while the right image is from the JWST in the infrared.\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/12\/hubble2-640x251.jpg 640w, https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/12\/hubble2-1024x401.jpg 1024w, https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/12\/hubble2-768x301.jpg 768w, https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/12\/hubble2-980x384.jpg 980w, https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/12\/hubble2.jpg 1200w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\"\/>\n                  <\/div><figcaption>\n<div class=\"caption font-impact dusk:text-gray-300 mb-4 mt-2 inline-flex flex-row items-stretch gap-1 text-base leading-tight text-gray-400 dark:text-gray-300\">\n<p>\n      Three views of NGC 4258 (Messier 106). The left and center images show the galaxy in visible light, while the right image is from the JWST in the infrared.<\/p>\n<p>              <span class=\"caption-credit mt-2 text-xs\"><br \/>\n          Credit:<\/p>\n<p>           ESA\/WEBB, NASA &amp; CSA<\/p>\n<p>                  <\/span>\n          <\/p>\n<\/p><\/div>\n<\/figcaption><\/figure>\n<p>Additional observations of Cepheid variable stars\u2014a total of 1,000 in five host galaxies as far out as 130 million light-years\u2014correlated with the Hubble data helped JWST see past the interstellar dust that has made Hubble&#8217;s own images of those stars more blurry and overlapping. This enabled astronomers to more easily distinguish between individual stars. Those results <a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/ad1ddd\">further confirmed<\/a> the accuracy of the Hubble data and allowed astronomers to rule out measurement error with a high degree of confidence.<\/p>\n<h2>A critical cross-check<\/h2>\n<p>This latest study serves as a critical cross-check to the April paper, using three different measurements to determine distances to galaxies known to be hosts to supernovae. &#8220;Cross-checking Hubble might sound prosaic, but the Hubble results demonstrate a profound tension in the Universe between how fast it is expanding now (measured by Hubble) versus the prediction from the standard model, LambdaCDM (calibrated by the Cosmic Microwave Background),&#8221; lead author Adam Riess, of the Space Science Telescope Institute at Johns Hopkins University, told Ars. &#8220;So Webb confirming Hubble means we are really seeing something amiss in the Universe.&#8221;<\/p>\n<p>The new study, which includes data from two independent groups working to refine the Hubble constant, encompasses about a third of the full galaxy sample collected by Hubble. The authors used the distance to the galaxy NGC-4258 (aka Messier 106) as a reference point, since that distance is known. They used pulsating stars known as Cepheid variables to calculate distances and cross-checked their work with complementary distance measurements based on carbon-rich stars and red giants. They ended up with a Hubble constant value of 72.6 km\/s\/Mpc, very close to Hubble&#8217;s value of 72.8 km\/s\/Mpc.<\/p>\n<\/p><\/div>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<br \/><div data-type=\"_mgwidget\" data-widget-id=\"1660802\">\r\n<\/div>\r\n<script>(function(w,q){w[q]=w[q]||[];w[q].push([\"_mgc.load\"])})(window,\"_mgq\");\r\n<\/script>\r\n<br \/>\n<br \/><a href=\"https:\/\/arstechnica.com\/science\/2024\/12\/latest-james-webb-data-hints-at-new-physics-in-universes-expansion\/\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Earlier this year, JWST researchers reported on measurements built on last year&#8217;s confirmation based on Webb data that Hubble&#8217;s measurements of the expansion rate were accurate, at least for the &hellip; <a href=\"https:\/\/hotvideos24.online\/?p=135218\" class=\"more-link\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8628],"tags":[],"class_list":["post-135218","post","type-post","status-publish","format-standard","hentry","category-science","entry"],"_links":{"self":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/135218","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=135218"}],"version-history":[{"count":0,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/135218\/revisions"}],"wp:attachment":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=135218"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=135218"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=135218"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}