Other civilisations in the Galaxy - are they really that likely?

quote:

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N = R* x f_p x n_e x f_l x f_i x f_c x L

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where:

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N is the number of extraterrestrial civilizations in our galaxy with which we might expect to be able to communicate

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and

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R* is the rate of star formation in our galaxy
f_p is the fraction of those stars which have planets
n_e is average number of planets which can potentially support life per star that has planets
f_l is the fraction of the above which actually go on to develop life
f_i is the fraction of the above which actually go on to develop intelligent life
f_c is the fraction of the above which are willing and able to communicate
L is the expected lifetime of such a civilization

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Drake equation - Wikipediain high school i tried plugging various estimates into the equation, and managed to get results ranging from "we're the only intelligent lifeforms in the galaxy and we're damned lucky to be here" to "second star to the right and straight on til morning and you'll find a few"

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אָרַח

well, not all creatures on this planet have adapted civilizations, although it could be said that most have some to some degree. what's to say that an adaptation MUST evolve?(btw you spelled "shalom" wrong)

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אָרַח