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Physics, 10.03.2020 03:42 cathyfrawley

Black holes are so named because A. they emit a perfect blackbody spectrum. B. no light or any other electromagnetic radiation can escape from inside them. C. all their electromagnetic radiation is gravitationally redshifted to the infrared, which leaves no light in the optical region. D. they emit no visible light, their only spectral lines are in the radio and infrared.

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