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**medio** · 12-23-2007, 03:46 PM

0.125 according to my equation

Rate of star formation in the galaxy = 1
Fraction of starts with planets = 0.5
Number of earth like planets/star = 0.01
Fraction of earth like planets where life develops = 0.25
Fraction where intelligent life develops = 0.01
Fraction where communication develops = 0.5
Lifetime of civilization after reaching radio communication = 20000

12-23-2007, 03:46 PM	#25
medio Join Date Oct 2005 Posts 543 Senior Member	0.125 according to my equation Rate of star formation in the galaxy = 1 Fraction of starts with planets = 0.5 Number of earth like planets/star = 0.01 Fraction of earth like planets where life develops = 0.25 Fraction where intelligent life develops = 0.01 Fraction where communication develops = 0.5 Lifetime of civilization after reaching radio communication = 20000
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