what part of a black hole is infinite
A black hole generally forms after a star dies in a titanic explosion known as a supernova, which crushes the remaining core into dense lumps. A maddening enigma called a singularity -- a region of infinite density -- lies at the heart of each black hole, according to general relativity, the modern theory of gravity. The infinite nature of singularities means that space and time as we know them cease to exist there.