Our understanding of how galaxies form and the nature of dark matter could be completely upended, after new observations of a stellar population bigger than the
The formation of galaxies is a fundamental paradigm underpinning modern astrophysics and predicts a strong decline in the number of massive galaxies in early cosmic times. Extremely massive quiescent galaxies have now been observed as early as one to two billion years after the DOI: 10.1038/s41586-024-07191-9