What is the paradox describing why the night sky should be bright but appears dark?

Answer

Olbers' Paradox

The fact that we observe vast stretches of blackness in the night sky, contrary to the expectation that an infinite, uniformly filled cosmos should result in a sky as bright as the Sun, is known as Olbers' Paradox.

What is the paradox describing why the night sky should be bright but appears dark?
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