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episode-23-the-drake-equation/
episode-23-the-drake-equation/
http://www.astronomycast.com/solar-system/episode-23-the-drake-equation/
Drake equation
Frank Drake
Link from a Wikipage to an external page
episode-23-the-drake-equation/
http://www.astronomycast.com/solar-system/episode-23-the-drake-equation/