NASA has discovered an unprecedentedly large cluster of black holes in our nearest galactic neighbor, Andromeda.
The 26 black hole candidates were spotted with the Chandra X-ray Observatory from more than 150 observations spread over 13 years.
Each of the black holes is of the kind that forms after a star collapses in on itself. As they suck in material from other stars that orbit or pass nearby, they also suck in material that gives out X-rays as it is consumed. It’s this that Chandra spotted.