건축 Architecture

Drake Equation

작성자 Uploader : physics 작성일 Upload Date: 2016-04-25변경일 Update Date: 2016-04-25조회수 View : 743

The Drake equation is a probabilistic argument used to arrive at an estimate of the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy.

N = R×fp×ne×fl×fi×fc×L  

N : the number of civilizations in our galaxy with which communication might be possible (i.e. which are on our current past light cone);
R : the average rate of star formation in our galaxy (ea/year)
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 (year)

*** 참고문헌[References] ***
N = R×fp×ne×fl×fi×fc×L
변수명 Variable 변수값 Value 변 수 설 명 Description of the variable

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