Faintest Galaxy Found Near Andromeda Defies Standard Formation Models
Astronomers at the University of Michigan have identified Andromeda XXXV, the faintest and smallest satellite galaxy ever detected outside the Milky Way. Located near the Andromeda Galaxy (M31), this object contains only about 20,000 solar masses and hosts stars roughly 6 billion years old. Its existence challenges current theories, which suggest such low-mass galaxies should have ceased star formation long ago due to gas depletion or cosmic reheating. The discovery, confirmed via Hubble Space Telescope observations, suggests that larger neighbors may siphon gas from smaller galaxies, abruptly halting their evolution, and highlights gaps in our understanding of how dwarf galaxies survive in the local universe.