Olbers' Paradox
Olbers' Paradox is a question about why the night sky is dark if the universe is infinite and filled with stars. If there are countless stars in every direction, one would expect the sky to be bright, as light from these stars should fill the space. However, this is not the case, leading to the paradox.
The resolution to Olbers' Paradox involves several factors, including the finite age of the universe and the expansion of space. Light from distant stars may not have reached us yet, and the universe is expanding, causing the light to redshift and become less visible.