Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. When will the Milky Way collide with the Andromeda Galaxy?

The Andromeda galaxy, also known as Messier 31 (M31), is the closest spiral galaxy to the Milky Way at a distance of about 2.5 million light-years. Astronomers use Andromeda to understand the ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Galactic halos are both more massive and more complicated than scientists realized, according to ...

Located 2.5 million light years away, the Andromeda galaxy is our closest galactic neighbor. The spiral galaxy is also the most distant object you can see with the naked eye from Earth, making it a ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A collision between ...

Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. The Andromeda galaxy is the galaxy next door, a very faint, fuzzy thing ...