New synthesis of astronomical measurements shows Hubble tension is real

4 hours ago

Astronomers have precisely measured the local Universe's expansion rate, confirming a persistent mismatch known as the Hubble tension.
Two methods yield different values: local measurements give about 73.50 ± 0.81 km/s/Mpc, while early Universe predictions suggest around 67-68 km/s/Mpc.
The H0 Distance Network Collaboration combined multiple distance-measurement techniques into a unified framework, achieving over 1% precision.
The discrepancy is unlikely due to errors in a single method, as removing individual techniques minimally affects the overall result.
This suggests the Hubble tension may indicate new physics beyond the standard cosmological model, such as modifications to dark energy or gravity.

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