eli5 black holes in outer space and how we discovered them and learned about him if we have never been to one

Question

eli5 black holes in outer space and how we discovered them and learned about him if we have never been to one

In: Other

Answer 1

We figured out that there’s no upper limit to mass density, and therefore no upper limit to the potential strength of gravity.

At a certain mass density, gravity pulls in faster than light can travel. Boom. Black hole.