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Using a sample of 155,600 old Milky Way stars, researchers estimate the Universe's age as 13.73 Gyr, consistent with CMB-based ΛCDM predictions and casting doubt on new physics solutions to the Hubble tension.
Cosmic voids, vast empty regions of space, may help solve mysteries about dark energy, gravity, and the Hubble tension. New telescopes and simulations are enabling detailed study of these voids.