The Problem of Olbers' Paradox
¥The sky is relatively dark at night, but in an infinite, eternal universe it should be at least as bright as the sunÕs surface!
Imagine universe divided up into spherical shells centered on us (like layers of an onion)
If stars reasonably uniform in distribution, then number of stars per shell increases with square of distance.
But apparent brightness of each star decreases with square of distance, so each shell provides an equal amount of brightness, and total will be infinite!