We now know however, that the universe is not infinitely old and static, the universe had a beginning - given birth by the Big Bang. This has important implications for Olbers Paradox. Because the universe has a finite age, one reason our night sky is dark is that many photons have not had time to reach us, those that have lie within our observable universe. This would not be so if the heavens had been around forever. The darkness of the night sky is a characteristic that argues against infinity.