In November 2025, astronomers argued that an overlooked age bias in supernova measurements meant the universe had already begun decelerating and dark energy was weakening. A Southampton-led team challenged that conclusion in June 2026, saying the supposed bias was largely already corrected for—but the original researchers have since disputed the rebuttal.

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1. Tue, 1 September 2026

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   • spacedaily.com06:35first to report
     In November 2025, astronomers argued that an overlooked age bias in supernova measurements meant the universe had already begun decelerating and dark energy was weakening. A Southampton-led team challenged that conclusion in June 2026, saying the supposed bias was largely already corrected for—but the original researchers have since disputed the rebuttal.

     A fundamental mystery about the universe's fate hinges on whether astronomers have been systematically mismeasuring the most distant stellar explosions.