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Unformatted text preview: N = The number of communicative civilizations R = The rate of formation of suitable stars (stars such as our Sun) f p = The fraction of those stars with planets. n e = The number of Earth-like planets per planetary system f l = The fraction of those Earth-like planets where life actually develops f i = The fraction of life sites where intelligence develops f c = The fraction of communicative planets (those on which electromagnetic communications technology develops) L = The "lifetime" of communicating civilizations Total 3. Do you think your answer is reasonable? 4. Which parameter was most difficult for you to choose? Explain why for full credit?...
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- Spring '08