A Black Hole is just that-a hole. When the star collapses in on itself, the matter's no longer there, its actually pushed through. After that, it comes out a White Hole, the exact opposite-litterally, the other end of a Black Hole. Black holes are only black since there's no light coming from them, and a white hole is only white since all of the light and matter is coming from it.
That was the gist of it anyways, I think.
This was Einstien's theory, at the very least. I think I read it as this anyways.