What are black holes?

The following is almost entirely theoretical.

It is my personal belief that black holes are other universes, much like our own. Black holes compress all material, that enters their boundaries, into an infinitesimal point. As a star goes supernova, a negative point in space emerges. This point, which we call a black hole, is negative to us, but everything with a negative end must have an exact opposite positive end. On 'the other side' of a black hole must be a positive end, in which all the compressed material is decompressed. Hydrogen gas is the original form of all material in our universe, according to the big bang theory. After being compressed to this infinitesimal point, the material would no longer be able to hold any physical properties. Upon decompressing, this material is likely to be in the form of hydrogen gas.

I'll have to think more on this theory, and I'll post an update later.