Drake equation: How many alien civilizations exist?

Drake equation: How many alien civilizations exist?

Are we alone? It is a question that has occupied mankind for centuries. Today, we live in an age of exploration, where robots on Mars and planet-hunting telescopes are beginning to allow us to edge closer to an answer.

via: http://www.bbc.com/future/story/20120821-how-many-alien-worlds-exist

x-post by Jered Higgins

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