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: * (c)2010 spacegeek.org

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