Black Holes: Crash Course Astronomy, 33

Weve covered a lot of incredible stuff, but this week were talking about the weirdest objects in space: BLACK HOLES. Stellar mass black holes form when a very massive star dies, and its core collapses. The core has to be more than about 2. 8 times the Suns mass to form a black hole. Black holes come in different sizes, but for all of them, the escape velocity is greater than the speed of light, so nothing can escape, not matter or light. They dont wander the Universe gobbling everything down around them;