The Drake Equation / Green Bank Formula

or are we alone in the universe?

Input Factors

Rate of Star formation: Suns/yr *

Fraction of these Stars with a Planetary system: *

Number of planets capable of hosting life in a planetary system: *

Fraction of these planets that do go on to develop life: *

Fraction of those that develop intelligent life: guesswork

Fraction of those that develop a civilization capable of communicating: guesswork

The lifetime of advanced civilizations: *

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