Overview
- The H0 Distance Network, which published Monday in Astronomy & Astrophysics, reports H0 = 73.50 ± 0.81 km/s/Mpc, or about 45.67 miles per second per 3.26 million light-years.
- The team of 37 researchers built a Local Distance Network that links many independent yardsticks, including Cepheid variables, red-giant stars, Miras, JAGB stars, Type Ia supernovae, megamasers, and galaxy scaling relations.
- Stress tests that removed individual techniques or switched datasets left the result unchanged, which counters the idea that one flawed method or telescope calibration drives the higher local value.
- The new value disagrees with early‑Universe estimates from the cosmic microwave background of about 67–68 km/s/Mpc, with researchers reporting a significance near seven sigma that is very unlikely to be chance.
- The authors say the persistence of this ‘Hubble tension’ may signal missing physics in the standard model, and they released open data and software so upcoming surveys such as the Vera C. Rubin Observatory can test whether the discrepancy holds.