A new theory of quantum gravity could explain the biggest puzzle in cosmology, study suggests

A variation on the theory of quantum gravity — the unification of quantum mechanics and Einstein’s general relativity — could help solve one of the biggest puzzles in cosmology, new research suggests.

For nearly a century, scientists have known that the universe is expanding. But in recent decades, physicists have found that different types of measurements of the expansion rate — called the Hubble parameter — produce puzzling inconsistencies.

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