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staedtler staedtler
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7 years ago
A black hole is so named because
A)   no light or other electromagnetic radiation can escape from inside it.
B)   all of its electromagnetic radiation is gravitationally redshifted to the infrared, leaving no light in the optical region.
C)   it emits a perfect blackbody spectrum.
D)   it is colder than the rest of the universe; that is, its effective temperature is less than 3 K.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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discovererdiscoverer
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7 years ago
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staedtler Author
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7 years ago
I really appreciate your help!
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