A family portrait of the Andromeda galaxy and its orbiting dwarf satellites raises questions about how galaxies evolve.

The existence of massive, elliptical galaxies in the early universe has puzzled astronomers for two decades. An international ...

Faint structures play a crucial role in cosmic development, and scientists are only just beginning to grasp their full extent ...

Add Yahoo as a preferred source to see more of our stories on Google. When astronomers look deep into the early universe, they don’t expect to see fully developed cosmic objects but small galaxies, ...

Intense radiation emitted by active supermassive black holes—thought to reside at the center of most, if not all, galaxies—can slow star growth not just in their host galaxy, but also in galaxies ...

New radio observations of molecular gas reveal how dozens of galaxies could have rapidly merged together in the early Universe.