Originally Posted by **kiwiheretic** I am told that black holes do in fact radiate energy, something called Hawking radiation, so not sure its temperature is zero. |

Originally Posted by **wad** Quite form Physics.org
"The most massive black holes in the Universe, the supermassive black holes with millions of times the math of the Sun will have a temperature of 1.4 x 10-14 Kelvin. That's low. Almost absolute zero, but not quite." |

Hawking radiation is a quantum phenomenon. The idea is that you can have a particle-antiparticle pair occur very close to the horizon of the hole. The antiparticle then falls into the hole, decreasing the hole's mass by a little and the other particle then flies away which is the radiation that is measured. (Don't ask me why it is the antiparticle going down the hole. There's some sort of thermodynamic process going on there.)

So, yes, the black hole will radiate energy in terms of an outflux of particles which gives it a "temperature."

-Dan