Mathmatical Proof of Advanced Civilizations?

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Mathmatical Proof of Advanced Civilizations?
How many advanced civilizations capable of radio astronomy where there, are there, could there someday be in the Milkyway galaxy? Dr. Carl Sagan ventures a guess.
Tags: Carl Sagan , Astronomy , Aliens and UFOs , Science , Video Clips 
Oct 25, 2009 9:18 PM
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