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F1r3bird4 karma

If the gravity of a black hole traps protons how can they emit hawking radiation?

And a second question, if the nature of a black hole's gravitational pull makes it unobservable, and we are observing all distortions and radiation coming off them from a very limited scope (read, from earth, around it, and some of space) how do we know that hawking radiation is not a result of mass that passes near to a black hole, rather than coming from it?

thank you for your time