Hubble discovers unusual movement of Andromeda's satellite galaxies

NASA's Hubble Space Telescope has observed 36 small galaxies around the Andromeda galaxy, revealing they are all moving in the same direction. This behavior differs from expectations based on previous studies of dwarf galaxies near the Milky Way. The study found that these dwarf galaxies continued to form stars long after their initial star production, challenging existing theories. Half of the galaxies are aligned on the same plane, which is unusual since mergers typically cause varied movements. Researchers suggest that Andromeda's recent collision with another galaxy may explain the unique characteristics of its satellite galaxies. This study indicates that dwarf galaxies can have diverse evolutionary paths, differing from those near the Milky Way.