"If they existed, they would be here." ---Enrico Fermi
Stated in a logical statement...if P...then Q. Wow, now that is something to ponder. And ponder someone did. His name is Frank Drake, who first thought (as a good scientist would)...what are the odds? Well of course you know that Scientists are really odds makers, which of course makes them a little odd...I digress...
Drake's equation goes like this...
N = (R_s)(f_p)(n_p)(f_b)(f_i)(f_c)(L_c)
"where R_s is the rate of star formation in the Galaxy, f_p is the fraction
of those stars with planetary systems, n_p is the mean number of planets
suitable for life per planetary system, f_b is the fraction of those plan-
ets suitable for life on which life actually developed, f_i is the fraction
of those planets with life on which intelligent organisms have evolved, f_c
is the fraction of those intelligent species that have developed communica-
tative civilizations, and L_c is the mean lifetime of those civilizations.
The first three factors are essentially astronomical in nature, the next
two are biological, and the last two are sociological. We are able to make
some educated estimates regarding the astronomical factors, we may be on
shaky ground with the biological ones, and we are almost playing numbers
games in trying to estimate values for the last two."
And it is a numbers game after all...just look at Carl Sagan's assessment:
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