Nearby galaxy groups hint at slower local expansion, easing Hubble tension
TL;DR Summary
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.
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