From Stephen Hawkings's "A Brief History of Time", page 111:

Since then the calculations have been repeated in a number of different forms by other people. They all confirm that black hole ought to emit particles and radiation as if it were a hot body with a temperature that depends only on the black hole's mass: the higher the mass, the lower the temperature.

How is it possible that a black hole appears to emit particles when we know that nothing can escape from within its event horizon?'

Bingley

Bingley