The Olbers' Paradox is a famous problem in astronomy and cosmology that addresses the question of why the night sky is dark if the universe is infinite and filled with an infinite number of stars. The paradox is named after the German astronomer Heinrich Wilhelm Olbers, who discussed it in the early 19th century, although the problem was considered by earlier astronomers as well.
The paradox can be summarized as follows:
If the universe is infinite and unchanging, and if there are stars distributed uniformly throughout space, then every line of sight from Earth should eventually intersect with a star.
Therefore, no matter where you look in the night sky, your line of sight should eventually reach a star.
If there are stars in every direction, then the night sky should be as bright as the surface of the Sun, regardless of the time of day or year.
