Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question?
A) Why is the sky dark at night?
B) What would it be like to ride on a beam of light?
C) How many stars are in the universe?
D) Can we measure the position and momentum of an electron at the same time?

Question

Quizplus · Accepted Answer

Olbers' paradox is the question of why the night sky is dark if the universe is infinite in size and age, with an infinite number of stars. One would expect that all lines of sight would eventually intersect with a star, leading to a bright sky at night. The paradox was resolved by understanding that the universe is finite in age, and stars have a finite life cycle, meaning that there hasn't been enough time for light from all stars to reach the Earth.

Olbers' Paradox Is an Apparently Simple Question, but Its Resolution