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Let us try to clear up terminology here: A black body is classically defined as a perfect absorber of radiation. No, it is not. The classical description of the perfect absorber also includes an emitter black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. A ...


The easiest way to see this is the third law of thermodynamics: every object in the universe has to have a temperature >0K, including black holes. Objects that have a temperature radiate. So if the temperature of the cosmic microwave background radiation is lower than the temperature of a black hole, the black hole has to radiate more energy into the ...

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