Why do black holes appear?
(And other black hole info)
The Basics of a black hole
What does a black hole look like?
The three types of black holes
Stellar- The middle class black hole. Our galaxy has many stellar black holes. Or at least potential black holes. They are also known as stellar mass black holes. Theses happen when a star stops producing stellar "energy" and it's reaction causes it to collapse.
Super massive-This is the biggest type of black hole. It could have a mass up to billions of times bigger then our sun. We are still trying to figure out how there made.