How many intelligent civilizations could there be in our galaxy?

The Drake Equation was devised by Dr. Frank Drake in 1960, in an attempt to estimate the number of extraterrestrial civilizations in our galaxy with which we might come in contact. The main purpose of the equation is to allow scientists to quantify the uncertainty of the factors which determine the number of such extraterrestrial civilizations.

Plug your own numbers into the equation with this interactive Flash:
–>Link to The Drake Equation

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