Scientists are investigating a fundamental discrepancy in cosmology where measurements of the universe's expansion rate from the early cosmos differ from those of nearby galaxies, and they are using gravitational waves from black hole mergers as an independent cosmic ruler to test whether dark energy, gravity, or cosmology itself may be incorrect.
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A Crack in the Cosmos? The Hubble Tension ExplainedAdded:
What if the universe just exposed a crack in physics? One speed comes from the early cosmos. Another comes from nearby galaxies. Now scientists want a new ruler. The soft, faint gravitational wave hum of countless black hole mergers. If it confirms the mismatch, dark energy, gravity, or cosmology itself may be wrong.
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