Black Holes Are So Named Because

question 13

Multiple Choice

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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