Biology 1002B Lecture Notes - Lecture 25: Spiral Galaxy, Photometer, Parabolic Reflector
24 Sep 2017
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F s p e: what we are actually trying to figure out, currently only know of 1. = number of planets that can potentially support life e. = the fraction of those planets that develop life s. = the fraction of those stars that have planets p. = number of stars: n f, n, l = average lifetime of a civilization f f f c l. = the fraction of planets that develop intelligent life i. = the fraction of planets willing and able to communicate: parameter, the longer a civilization is around, the greater the chance we can detect and communicate with them. Number of stars (ns: 100 billion (1011) stars in the galaxy. Set ne=2 (two habitable planets per solar system) N = n s x f p x n x f x f x f c i l e.
