The Andromeda galaxy is surrounded by a constellation of dwarf galaxies that are arranged in a highly lopsided manner. Analysis of cosmological simulations reveals that this degree of asymmetry is ...

Located 2.5 million light-years away, the majestic Andromeda galaxy appears to the naked eye as a faint, spindle-shaped object roughly the angular size of the full moon. What backyard observers don't ...

Our Milky Way galaxy and Andromeda are destined to collide with each other in roughly 5 billion years, but the galaxies may already be exchanging stars. A new study suggests that hypervelocity ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. M31, the Andromeda Galaxy, is one of the most spectacular ...