Vast cluster of ancient galaxies could rewrite the history of star formation

Astronomers have discovered a vast, dense cluster of massive galaxies just 1 billion years after the Big Bang, each forming stars at an intense rate from collapsing clouds of dust. Reported in Astronomy & Astrophysics by an international team, led by Guilaine Lagache at Aix-Marseille University, the structure appears to challenge existing models of how rapidly stars could have formed in the early universe.