A way of using variable stars—stars that changed their light output in a repeating cycle—allowed astronomers to determine distances to star groups ... to the Andromeda Galaxy much more ...

Astronomers at the University of Michigan have discovered a new satellite of the Andromeda ... whose star formation shut off ...

Dozens of dwarf galaxies swarming around the Andromeda ... our galaxy's sphere of influence, where gravitational tidal forces stirred up pockets of gas to reignite the process of star birth.