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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.

Drake Equation, a mathematical equation used to estimate the number of detectable extraterrestrial civilizations in the Milky Way galaxy.

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Drake Equation - Considerable disagreement on the values of most of these parameters exists. Drake states that given the uncertainties, there are probably between 1000 and 100,000,000 civilizations in the galaxy. {Wikipedia}

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from Scoop.it

Interactive Graphic: Drake equation - How many alien civilizations exist in our galaxy alone?

Play with our interactive graphic to work out how many intelligent civilizations there could be in our universe.Are we alone? It is a question that has occupied mankind for centuries... | P O C: Présentation Originale des Connaissances

from Live Science

Aliens? Yes Please. UFOs? No Thanks

SETI uses the Arecibo's 305-meter telescope — the largest in the world — to scan the sky for signals from alien civilizations all year round...