A new study of M31, also known as Andromeda, explains how our cosmic neighbor kills off smaller nearby galaxies.

Astronomers know that mergers play a huge role in galaxy growth. Right now, the Milky Way is slowly consuming the Large and ...

The majestic Andromeda Galaxy, our closest galactic neighbor, glimmers with hundreds of billions of stars. The striking Galaxy NGC 772 boasts a bright central core and delicate, swirling arms. The ...

The newly released Andromeda image represents a decade of careful tracking and uninterrupted observation. Scientists expected a crisp portrait of the neighboring galaxy, but the final scan revealed ...

Polish astrophotographer Piotr Czerski has been honored with NASA’s prestigious Astronomy Picture of the Day (APOD) distinction.

The typical blue spiral galaxy (top) continues to form stars actively until it collides with another galaxy. At that point, an active galactic nucleus (AGN) is formed that depletes the galaxy of dust, ...