What is a black hole? A black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. There are three kinds of black hole that we have strong evidence for:
1. Stellar-mass black holes are the remaining cores of massive stars after they die in a supernova explosion.
2. Mid-mass black hole in the centers of dense star clusters
3. Supermassive black hole are found in the centers of many (and maybe all) galaxies.
If black holes are black, how can we find them? This Black Hole Map will show you where they are and all the key information you need to start a black hole galaxy quest. Best enjoyed with a bowl of popcorn and a radio telescope.