When was the first time you asked yourself why it's dark at night despite all the trillions of stars out there?
From Wikipedia: In astrophysics and physical cosmology, Olbers’ paradox, is the argument that the darkness of the night sky conflicts with the assumption of an infinite and eternal static universe.
Watch this wonderfully animated GIF file:
http://en.wikipedia.org/wiki/File:Olber%27s_Paradox_-_All_Points.gif
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