JWST crowding test, 2024

The 2024 JWST Cepheid crowding study argues that unrecognized crowding does not explain the Hubble tension.

JWST observations reject unrecognized crowding of Cepheid photometry as an explanation for the Hubble tension.

It matters here because it tests Dru's June explanation in the measurement-or-physics question. Ruling out that explanation does not by itself identify new physics.

Source: arxiv.org.