Olbers' Paradox
Why the sky is dark at night?

German physicist Heinrich Wilhelm Olbers put this puzzle in 1823: If the universe is infinite in size, and stars (or galaxies) are distributed throughout this infinite universe, then we are certain to eventually see a star in any direction we look. As a result, the night sky should be bright.
Why isn't it?

Olbers' Paradox


 

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Wikipedis: Olbers' paradox.   www.physics.org   Scientific American March 22, 1999.   Olbers' Paradox.  
Olbers' Paradox.   Olbers' Paradox.   Olbers' Paradox.   youtube vedeo: Why is it Dark at Night?