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N = N* fp ne fl fi fc fL

 

The Drake equation states that:

 

where:

 

N is the number of civilizations in our galaxy with which we might expect to be able to communicate at any given time

and

 

R* is the rate of star formation in our galaxy

fp is the fraction of those stars that have planets

ne is average number of planets that can potentially support life per star that has planets

fl is the fraction of the above that actually go on to develop life

fi is the fraction of the above that actually go on to develop intelligent life

fc is the fraction of the above that are willing and able to communicate

L is the expected lifetime of such a civilization

 

en.wikipedia.org/wiki/Drake_equation

 

ODT - In the distance

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Taken on February 16, 2007