The Andromeda Galaxy, also known as M31, is more than just a faint smudge in the night sky; it’s a colossal spiral galaxy, similar in size and structure to our Milky Way, and the closest galactic ...

A decade of observations by NASA’s Hubble Space Telescope has produced the sharpest and most detailed images of the Andromeda galaxy. Zoom in and explore.

Twin orbs of superhot plasma at the Milky Way's center known as the "Fermi bubbles" contain inexplicable clouds of cold ...

An international team of astronomers has discovered a massive cloud of gas and dust located in a little-known region of our ...