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Across a network of nearby stars, supernova hosts, and galaxies<\/a>, the expansion rate holds steady even as different measurement paths converge on the same result.\u00a0<\/p>\n By linking these observations, Stefano Casertano at the Space Telescope Science Institute (STScI<\/a>) directly connected multiple independent distance markers to a precisely measured rate of 45.7 miles per second for every 3.26 million light-years.<\/p>\n Removing entire classes of measurements shifts the result only slightly, showing that no single method is driving the outcome.\u00a0<\/p>\n That stability narrows the range of plausible explanations and points toward deeper causes behind the unresolved discrepancy.<\/p>\n Why the number matters<\/p>\n At the center sits the Hubble constant, which is the number that tells how fast space stretches as distance increases.<\/p>\n Nearby measurements put the expansion rate at about 45.7 miles per second for every 3.26 million light-years, higher than predictions based on the early Universe.<\/p>\n Yet measurements<\/a> based on the early Universe point to a slower expansion rate, closer to 41.6 miles per second on the same scale.<\/p>\n Because those answers refuse to meet, astronomers call the dispute the Hubble tension<\/a>, a clash between early and late measurements.<\/p>\n Building many routes<\/p>\n Instead of trusting one chain of measurements, the team linked routes that started nearby and reached far outward.<\/p>\n Cepheids, red giant stars, supernovae, and galaxy methods cross-checked one another, so shared information strengthened the result instead of hiding conflicts.<\/p>\n \u201cThis isn\u2019t just a new value of the Hubble constant, it\u2019s a community-built framework that brings decades of independent distance measurements together, transparently and accessibly,\u201d wrote the H0 Distance Network Collaboration, the international team behind the study.<\/p>\n That design matters because a wrong answer from one route should have tugged the network harder than it did.<\/p>\n Why stars help<\/p>\n Among the most useful markers were pulsating stars called Cepheids<\/a>, whose rhythm reveals true brightness.<\/p>\n Once astronomers know how bright one should be, they can compare that to how bright it looks and get distance.<\/p>\n Red giant stars added another rung, because a brightening late in their lives reaches nearly the same luminosity each time.<\/p>\n Using both stellar clues cut the odds that one population, one telescope, or one calibration rule was distorting everything.<\/p>\n How supernovae reach farther<\/p>\n Far beyond those stars, astronomers relied on so-called Type Ia supernovae<\/a>, exploding white dwarfs with consistent peak brightness.<\/p>\n Their brightness was calibrated in nearer galaxies whose distances came from stars, letting the explosions carry that scale outward.<\/p>\n Because they shine so brightly, they sampled places where cosmic expansion overwhelms the smaller motions of nearby space.<\/p>\n Galaxy-based methods reached similar distances too, and swapping them in barely changed the result.<\/p>\n What the checks showed<\/p>\n Hundreds of tests asked whether a missing method, an anchor galaxy, or one telescope could drag the answer away.<\/p>\n Leaving out Cepheids<\/a> raised the uncertainty, but most versions stayed clustered around the same central number.<\/p>\n Removing Hubble observations widened the error more than removing Webb data, yet neither version broke from the baseline.<\/p>\n That pattern made the disagreement harder to dismiss as an accident of one instrument or favorite method.<\/p>\n Why simple error fails<\/p>\n Even separate paths through the data landed on compatible answers, despite using different anchors, tracers, and calibration steps.<\/p>\n The results rule out the idea that the mismatch can be explained by a single overlooked error in how local distances are measured.<\/p>\n To erase the gap now, several independent tools would need to lean the same wrong way at once.<\/p>\n That remains possible in principle, but it has become a much narrower path than it was before.<\/p>\n What physics may need<\/p>\n If measurements are right, then the problem may sit in the model used to project ancient light into today\u2019s universe.<\/p>\n That model includes ordinary matter, dark matter, gravity, and dark energy<\/a>, the unknown influence driving cosmic acceleration.<\/p>\n A missing particle, a changing dark energy behavior, or a tweak to gravity could all alter the early prediction.<\/p>\n None of those ideas has won yet, but the case for looking beyond tidy assumptions just got stronger.<\/p>\n Because the team released software and data, later groups, from STScI to elsewhere, can plug into the same framework without rebuilding everything.<\/p>\n Webb, giant ground telescopes, and future surveys can extend stellar markers farther out and tighten the cross-checks.<\/p>\n More geometric anchors would help most, because they set the absolute scale before any ladder or network reaches outward.<\/p>\n Each added route will test the same disagreement again, and that repeated pressure is how the story moves forward.<\/p>\n Where things stand<\/p>\n What emerges is a faster nearby universe measured by many paths that keep backing one another up.<\/p>\n Whether the fix lies in new physics or a subtler rethink of old assumptions, the mismatch has become harder to wave away.<\/p>\n The study is published in Astronomy & Astrophysics<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.\u00a0<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A new analysis has found that the local Universe is expanding faster than predicted from the early Universe,…\n","protected":false},"author":2,"featured_media":586128,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[199,79],"class_list":{"0":"post-586127","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-physics","8":"tag-physics","9":"tag-science"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/586127","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=586127"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/586127\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/586128"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=586127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=586127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=586127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}