Nearby galaxy groups hint at slower local expansion, easing Hubble tension
Two studies of the Centaurus A and M81 galaxy groups estimate a local Hubble constant around 64 km/s/Mpc, slower than some nearby measurements and closer to the CMB/LCDM value, suggesting less dark matter may be needed and that the Hubble tension could be mitigated by analyzing more galaxy groups with upcoming 4MOST data.