According to general relativity, a black hole is

A) an object that cannot be seen.
B) a hole in the observable universe.
C) a place where light travels slower than the normal speed of light.
D) a place where light travels faster than the normal speed of light.
E) a place where there is no gravity.


B

Physics & Space Science

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The background microwave radiation, discovered in 1965 by Penzias and Wilson, has its peak intensity at a wavelength of 1.06 mm

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Physics & Space Science