Message #3218, a followup to #3217

Name:	Frank Drake
Date:	Wednesday August 4, 2021 12:12:40 pm MDT
URL:	https://www.seti.org/drake-equation-index
Subject:	Drake equation
Message:	The Drake equation is: N=R??fp?ne?fl?fi?fc?L where: N = the number of civilizations in our galaxy with which communication might be possible (i.e. which are on our current past light cone); and R? = the average rate of star formation in our galaxy fp = the fraction of those stars that have planets ne = the average number of planets that can potentially support life per star that has planets fl = the fraction of planets that could support life that actually develop life at some point fi = the fraction of planets with life that actually go on to develop intelligent life (civilizations) fc = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space L = the length of time for which such civilizations release detectable signals into space

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