The article explains it well, but for the uninitiated, the so-called Hubble Tension has been one of the major questions in cosmology for the past several decades. The Webb telescope has so far corroborated Hubble’s results, which deepens the problem as there is now very little chance that it is an error in measurement rather than of theory.
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I suppose there could be an error in measurement on the other side of the tension, not that i ever read the papers closely enough to remember what method that was. but i personally doubt that, i'd like to think there's actually something interesting in the hubble tension
