"Discovery of Ultra-Faint Star System Challenges Galaxy Classification"
Astronomers have discovered a tiny, faint satellite galaxy named Ursa Major III/Unions 1, consisting of only 60 stars and potentially dominated by dark matter. This finding challenges current understanding of galaxy formation and could represent a new class of extremely faint stellar systems. The galaxy's survival for at least 10 billion years, despite the Milky Way's strong gravitational forces, has puzzled scientists. The discovery offers the possibility of gaining insights into dark matter's composition and behavior, and may lead to the identification of similar elusive stellar systems.