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BBC - Future - Science Environment - Drake equation How many alien civilizations exist -152752

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[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.

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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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Drake equation - Wikipedia, the free encyclopedia

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

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Drake equation - Wikipedia, the free encyclopedia

Drake equation - Wikipedia, the free encyclopedia

from Life in Pen and Ink

### Intelligent Life: Apply Elsewhere

"The Drake Equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy."

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