On Dec. 15, 1612, the Andromeda galaxy was seen through a telescope for the first time by a German astronomer named Simon Marius. [‘On This Day in Space’ Video Series on Space.com] The Andromeda ...

A new study of super-fast-moving stars suggests that they were accelerated by a monster black hole that's been lurking unseen in the galaxy next door. This appears to be the closest supermassive black ...

What does the Milky Way look like? Sometimes, the billions of stars comprising our home galaxy appear especially vibrant during “Milky Way season” as the band arcs across the night sky. The reason has ...

The Milky Way could be coming to a sky near you. The billions of stars comprising our home galaxy should appear especially vibrant in late-May as the band arcs across the night sky. The reason has ...

An artists impression of a black hole flinging a hypervelocity star out of the Large Magellanic Cloud. (CfA/Melissa Weiss) A new study of super-fast-moving stars suggests that they were accelerated by ...