Stellar mass black holes.
These are eating the universe Black holes there are 3 types of black holes. Stellar mass ones for e.g Cygnus x1 is a stellar mass they are aka as Normal sized black holes that means the next one I am talking about a big one.
SuperMassive black holes
Super massive black holes are the last black hole type everybody should know. For E.G I have Sagittarius A they are at the center of a galaxy that means there more violent then the other ones.