Hubble Constant Puzzle Deepens as Supernova and CMB Measurements Clash

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Astronomers are testing a new way to measure the universe’s expansion rate using the gravitational-wave background detected by NANOGrav. By treating the cosmic hum from merging supermassive black holes as a statistical “stochastic siren,” researchers hope to calculate the Hubble constant and help resolve the long-standing Hubble tension between supernova and cosmic microwave background measurements.

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