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watch #documentaries on http://docur.co [astrobiology] The famous Drake Equation put forward by Frank Drake back in the 1961. See also "Rare Earth equation" (a somewhat less trusted equation, but interesting nonetheless). ~Al. A.

On behalf of the entire SETI Institute, we wish one and all a safe and happy holidays and a joyous new year, full of wonder and exploration! -- Bill Diamond, President and CEO (Image credit: Danielle Futselaar)

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Drake Equation - L = the length of time for which such civilizations release detectable signals into space. {Wikipedia}

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Drake Equation - ne = the average number of planets that can potentially support life per star that has planets. {Wikipedia}

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Were we contacted by aliens in 1977?