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khemist
khemist is offline
#4
Apr5-11, 12:09 PM
P: 267

two black hole question


Quote Quote by Lapidus View Post
An outside observer never sees stuff heading towards a black hole crossing the event horizon. How then do black holes form? If I would have watched region in spacetime where today exists a black hole for the last two billion years, how did the black come into existence?

Is it true that bigger black holes do not evaporate, since the cosmic microwave radiation is hotter than them? Why then then all the fuss about the information loss problem?

thank you
Black holes are believed to radiate Hawking radiation.

The black hole came into existence because a star collapsed under its own gravity after the pressure from the nuclear reactions inside the star subsided.