The Andromeda galaxy is surrounded by a constellation of dwarf galaxies that are arranged in a highly lopsided manner.

Before our minds start to reel at these scales, let's return to the Andromeda Galaxy and examine it from our vantage point on the dust-grain planet we call Earth. The remarkable thing is that the ...

The smallest, dimmest galaxy orbiting Andromeda to date. Image: CFHT/MegaCam/PAndAS (Principal investigator: Alan McConnachie; Image processing: Marcos Arias A group of astronomers has discovered ...

A Michigan State University researcher saw X-rays coming from a black hole using the NASA Chandra X-Ray Observatory telescope ...

Gravity will likely tug the Sun into a new orbit, dragging Earth and the other planets with it. But even though the Milky Way and Andromeda each have 100 billion stars, it's unlikely that many ...