An ultra-faint, chemically primitive galaxy forming in the reionization era

Nature, Published online: 13 May 2026; doi:10.1038/s41586-026-10374-1

LAP1-B—an ultra-faint and tiny galaxy that formed in the reionization era and is strongly magnified by gravitational lensing—is chemically primitive and hosts very few stars in an otherwise dominant dark matter halo.