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This was all quantified in 1961 by the famous "Drake Equation". Click this link to calculate the estimated number of alien civilizations in the galaxy.
http://www.classbrain.com/artmovies/publish/article_50.shtml
Do you believe in aliens?
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This was all quantified in 1961 by the famous "Drake Equation". Click this link to calculate the estimated number of alien civilizations in the galaxy.
http://www.classbrain.com/artmovies/publish/article_50.shtml