A Hubble Space Telescope optical image of our nearest neighbor galaxy, Andromeda (M31), with an inset X-ray image of the active center made with the XMM-Newton observatory. The newly discovered ...

Cosmological simulations say that such an alignment should not happen, with a probability of less than 0.3%. Our neighboring Andromeda Galaxy (Messier 31, or M31) appears to sport a lopsided ...

Despite being one of the most venerable and prominent objects in the night sky, the Andromeda Galaxy (M31) still has surprises. And a group of amateur astronomers have uncovered the latest: a ...

November’s night skies are grand, festive and bright in many places, quiet and contemplative in others. Both tempers are ...

As the crisp autumn air rolls in, October presents a prime opportunity for stargazers to witness the beauty of the Andromeda Galaxy (M31). Just as the Milky Way’s closest neighbor climbs high above ...

Andromeda (M31) is a popular target among astronomers. Under clear dark skies, it is even visible to the naked eye. Its proximity and similarity in structure to our spiral galaxy, the Milky Way, make ...

The 2011 Brit Marling sci-fi film Another Earth posited the idea of a mirrored version of Earth entering the Milky Way. The idea seems preposterous, and it probably is–in the film, the “other Earth” ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Go into your backyard about 20:30 p.m. EST or thereabouts ...

A composite figure of the Andromeda galaxy (M31) highlights the extremely large field of view of NASA's upcoming Wide Field Infrared Survey Telescope (WFIRST). The background consists of ground-based ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. M31, the Andromeda Galaxy, with its companion galaxies, M32 ...