BTZ black hole

A black hole is a place in space that is so big and has so much gravity, not even light can get out. A BTZ black hole is a special type of black hole that is named after three people: Banados, Teitelboim and Zanelli. BTZ black holes form inside of a universe that can have more than three dimensions. Pretty much anything that falls into a BTZ black hole is gone forever and can never come out!