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Radiation seen by static observers due to quantum effects in close vicinity to a black hole, leading to the potential for eventual evaporation of black holes. Pictorially, a particle-antiparticle pair is created, with one falling through the horizon, becoming causally lost to the rest of the universe, while its neighbor escapes the gravitational potential. Originally predicted by S. Hawking in the 1970s using quantum field theory in curved spacetime.