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Researchers discovered how to use gravitational waves to solve one of physics' biggest mysteries: why we get different answers when measuring how fast the universe is growing. This breakthrough could finally end the decade-long "Hubble tension" debate.
Scientists just finished mapping 669 million galaxies over six years, and the good news is our understanding of how the universe works passed the test. The Dark Energy Survey reveals our cosmic models are on track, even as they point toward exciting new mysteries to solve.