Astronomers measure local universe expansion at 73.50 km/s/Mpc with 1% precision in April 2026, deepening Hubble tension mismatch with early universe predictions of 67-68 and ruling out single-method errors.

The Local Universe’s Expansion Rate Is Clearer Than Ever, but Still Doesn’t Add Up - A new synthesis of astronomical measurements confirms a persistent mismatch that could point to physics beyond current models

noirlab2611 — Science Release A new synthesis of astronomical measurements confirms a persistent mismatch that could point to physics beyond current models 10 April 2026 An international collaboration of astronomers has produced one of the most precise measurements yet of how fast the local Universe is expanding. The result deepens one of the most significant challenges in modern cosmology. John Blakeslee, astronomer at NSF NOIRLab, funded by the U.S. National Science Foundation, is a member of ...