The Andromeda galaxy is also known as Messier 31. It is a spiral galaxy located about 2.5 million light-years from Earth. On ...

The Andromeda Galaxy, located 2.5 million light years away, has fascinated observers for centuries. Once believed to be part of the Milky Way, everything changed in 1923 when Edwin Hubble identified ...

“For example, Chandra’s X-rays reveal the high-energy radiation around the supermassive black hole at the center of M31 as ...

A collision between our Milky Way galaxy and the neighboring Andromeda galaxy, long considered inevitable, may be in question, astronomers say.

New data show a 50% chance the Milky Way won't collide with Andromeda. A merger with the Large Magellanic Cloud is far more likely.

Shockingly Tiny Galaxy Near Andromeda Is Just One-Millionth the Size of the Milky Way The fully formed galaxy is remarkably teeny, raising new questions about how galaxies emerge and evolve.

NASA recently released images of the Andromeda galaxy, an "enticing empire of stars" that can be seen with the naked eye if weather conditions are just right.

Located at a distance of 2.5 million light-years, the Andromeda Galaxy is readily visible to the unaided eye on dark, clear nights. Here's where you should look this week.

Though tiny, this newfound satellite galaxy around M31 offers big lessons — and questions — about how galaxies evolve.

A collision between our Milky Way galaxy and the neighboring Andromeda galaxy, long considered inevitable, may be in question, astronomers say.

In roughly 4 billion years, our home Milky Way galaxy may collide with the neighboring Andromeda galaxy.