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Electromagnetic radiation which, according to theory, should be emitted by a black hole. The radiation is due to the black hole capturing one of a particle-antiparticle pair created spontaneously near to the event horizon.
‘Stephen Hawking showed that the entropy of matter absorbed by a black hole is stored in the surface area of its event horizon and is released back into the universe as the black hole decays by Hawking radiation.’
‘The Second Law of Thermodynamics requires that black holes emit so-called Hawking radiation, which can exert a sort of ‘buoyant force’ on nearby matter.’
‘In simple terms, what is now known as Hawking radiation is produced when quantum fluctuations give rise to pairs of short-lived virtual particles near the event horizon.’
‘Black hole entropy as a concept grew out of the theoretical discovery of Hawking radiation, the outcome of combining quantum particle theory with classical gravity in the vicinity of a black hole.’
‘Black holes tend to be very heavy, so their output of Hawking radiation would be too low to detect experimentally.’