Question: Sec. 1 4 - 4 : A black hole is so named because it is colder than the rest of the universe; that is ,

Sec. 14-4: A black hole is so named because
it is colder than the rest of the universe; that is, its effective temperature is less than 3 K .
no light can escape from it due to its powerful gravitational field.
the gravitational field is so high that the wavelength of its emitted light is gravitationally redshifted to radio wavelengths.
it emits no visible light because it is so cold, less than 100 K .
Sec. 1 4 - 4 : A black hole is so named because

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