I think Hawking has theorized or proved that black holes emit light.

I would go on to suggest that black holes are particles, like sub-atomic particles, if it is true that all forces can be unified. In which case the two black holes might act like the nucleus of a helium atom, with planets or stars behaving analagously to electrons in the atom.

If the four forces are unified, there is only one type of particle, and what it is doing is expanding. Different particles would be at different stages of expansion. This is what Einstein meant when he told Nash that "it's a trivial problem in fixed point theorem." You might have thought from reading "A Beautiful Mind" that Einstein was talking about Nash's math axioms but he was making a joke about the unlikelihood of game theory turning up in the greater cosmic questions.

I have come up with equations which give the gist of what the unified field theory is, if there is one. But that's another heading.