"Discovery of Ultra-Faint Star System Dominated by Dark Matter in Milky Way"

Astronomers have discovered a peculiar system of stars, Ursa Major III/Unions 1 (UMa3/U1), 30,000 light-years away, containing only 60 visible stars and possibly dominated by dark matter. Its nature is uncertain, with two possibilities: a tiny galaxy stabilized by dark matter or a star cluster observed at a unique time. If UMa3/U1 is a dwarf galaxy, it could provide insights into how the Milky Way formed and challenge current understanding of galaxy formation. The system's low luminosity has made it difficult to detect, and its discovery may lead to a new class of extremely faint stellar systems.