CDS Model Paper 4 General Knowledge

A black hole is a region of space from which nothing, not even light, can escape. It is the result of the deformation of spacetime caused by a very compact mass. The simplest black hole has mass but neither electric charge nor angular momentum. The mass of a black hole is finite, the reason why a black hole has infinite density is that it's mass is concentrated into a space of zero-volume. Thus, it has a very high density.