Simply stated, Olbers’ paradox says that if the universe is infinite and static, then at any given angle from the Earth the line of sight will end at the surface of a star. An infinitely old universe means that there has been plenty of time for the light from every star that has ever shined to reach our eyes. When we look up, there should be a star everywhere, in every piece of sky. Because of this, the sky at night should be just as bright as when the Sun is up.