How Dense is a Black Hole?

It is said that a black hole is infinitely dense. It forms when a star dies. At this point, the star can either form into a supernova or have the immense gravity basically make the star implode upon itself, making a black hole. A black hole is also inferred to be a gap in time and space as well. Think of time and space as a blanket pulled tautly. Then imagine a bowling ball thats dropped on it. It makes an indent in the blanket as it sinks down. This is what a black hole does in time and space but it never has a bottom. m Hope this helped.