: I am in a very good science class and we are learning about black holes. My teacher Mr.Lindasy teaches it very well. He said that black are dead stars. He also explained to me if the black hole can suck up a planet .I didn't get what he said.so thats my question. Can black holes suck up planets?

In short, YES. Nothing that enters the "Event horizon" or the black hole can ever escape. Even entire planets. Black holes are black because not even light can escape them. Most black holes are millions of times the size of our sun. So, on your way to science class, try not to step into any black holes. :)