How hot (or cold) is a Black Hole?
Short Answer – the temperature of a black hole is inversely proportional to its mass. For a black hole with the same mass as our Sun, the temperature is 60 billionths of a degree kelvin.
Black holes are objects that have an escape velocity greater than the speed of light. And since nothing is faster than the speed of light, nothing can escape a black hole (no matter what Christopher Nolan’s views of love are). With the term black hole, we indicate an area of the Universe enclosed by an event horizon. The event horizon is the surface of the black hole, the last position where light can escape.
I hope all of that was clear and straightforward because now things get interesting. Let me say this again: nothing can escape a black hole. Once you cross the event horizon, it’s goodbye Universe. Unless, of course, you’re a subatomic particle.
The escape of particles has to do with the laws of quantum mechanics, and the process was given a theoretical justification by Stephen Hawking in 1974. It shouldn’t come as a surprise that this phenomenon is called ...