Do physicists nowadays accept the possibility of a white hole or not? I heard from someplace that quasars are considered by some to be white holes simply because for a quasar to be as bright as it is and for it to be a supermassive black hole, it would have to consume more matter each year than there could be around it. I was wondering, if it's the exact opposite of a black hole, shouldn't time speed up near it? And where would this matter come that's flowing out of it all the time? White holes were considered to be the 'exit points' of black holes, or so I've heard. So I guess the concept was created to deal with the existence of black holes and to get the matter out of them again. But if a black hole emits radiation and finally evaporates, then there's no need for white holes anymore, is there? Speaking of which, what exactly happens when a black hole has lost enough energy via evaporation that its mass is no longer sufficient for it to be a singularity? Would a sea of very high energy photons stream out of it? Or would there be other particles as well? Could a stellar body of some sort form in its place? Would such a black hole's end of life explain the very high energy particles that have been observed?