If you apply Newtonian physics then the gravity of black holes let nothing escape including light - that's why they're black
However the weirdness of Quantum mechanic allows for particles to escape
in QE for particles to appear spontaneously in empty space and in random locations
I must admit I only have a partial understanding of Quantum Mechanics!
"One of the pair falls into the black hole while the other escapes. In order to preserve total energy, the particle that fell into the black hole must have had a negative energy"
"Hawking showed that quantum effects allow black holes to emit exact black body radiation, which is the average thermal radiation emitted by an idealized thermal source known as a black body. Theelectromagnetic radiation is as if it were emitted by a black body with a temperature that is inversely proportional to the black hole's mass."
http://en.wikipedia.org/wiki/Hawking_radiation
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