Drake equation

The Drake equation was devised in an attempt to estimate the number of extraterrestrial alien species that could communicate with Humans. The first and more mathematical variation stated:
:N = R^{*} \times f_{p} \times n_{e} \times f_{l} \times f_{i} \times f_{c} \times L
:where:
::* is the number of extraterrestrial civilizations in our galaxy with which we might expect to be able to communicate 
:and
::* is the rate of star formation in our galaxy 
::* is the fraction of those stars which have planets 
::* is average number of planets which can potentially support life per star that has planets 
::* is the fraction of the above which actually go on to develop life 
::* is the fraction of the above which actually go on to develop intelligent life 
::* is the fraction of the above which are willing and able to communicate 
::* is the expected lifetime of such a civilization 
The second variation stated:
:F f ^ 2 (M g E) - C ^ 1 Ri^1 \times M = L / So
In 1996, Rain Robinson had a poster of the two variations of the equation right behind her computer monitor in her office at the Griffith Observatory. ()
== External link ==
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fr:Équation de Drake
Category:Mathematics