A star in the Andromeda Galaxy has inexplicably vanished, leaving behind a puzzling red light source that is baffling astronomers.

The northern sky's greatest galaxy gets its familiar name from the northern constellation where it resides, Andromeda the ...

China's Wide Field Survey Telescope has captured an amazing view of the Andromeda Galaxy (M31). Credit: Space.com | footage ...

While two teams have ideas about what happened to yellow supergiant M31-2014-DS1, ultimately, it remains a mystery.

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” ...

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 ...

Dots show locations of stars in the spectroscopic survey superimposed on an image of the Andromeda galaxy (M31). Dots are color coded according to their velocity relative to the Milky Way, as measured ...