Black body, Kardashev Scale Wiki

A black body is an object that absorbs all electromagnetic radiation, or all colors of light. It emits electromagnetic black-body radiation at Planck scales. A black hole absorbs all the light that hits its event horizon, reflecting nothing, making it almost an ideal black body. Hawking radiation is black-body radiation that is released by black holes because of quantum effects near the black hole event horizon. The universe approximately a second after the Big Bang was a near-ideal black body a

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