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flag A South Korean study challenges the idea of accelerating cosmic expansion, suggesting dark energy is weakening and the universe may slow down, based on reanalyzed supernova data.

flag A South Korean study published November 6, 2025, challenges the long-held belief that the universe’s expansion is accelerating, suggesting instead it may be slowing due to weakening dark energy. flag Researchers reanalyzed Type Ia supernovae data, finding that their brightness varies with the age of host galaxies, introducing a previously overlooked bias. flag After correcting for this, the evidence for accelerating expansion disappears, aligning better with models showing deceleration and a potential future "big crunch." flag The findings, supported by DESI survey data, could resolve the Hubble tension and prompt a major shift in cosmology, though experts remain cautious, awaiting confirmation from upcoming observations.

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