Are We Alone?

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In 1961, astronomer Frank Drake came up with an equation to estimate how many intelligent alien civilizations might exist in our galaxy. Each variable is a crucial factor for developing such a civilization.
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Published by BBC
Designed by Information is Beautiful
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Added: 8 months ago

Rank: 26 of 551 in Science

Tags: space, Aliens, universe

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

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