N = N* fp ne
fl fi fc
fL
N* represents the number of stars in the
Milky Way Galaxy
fp is the fraction of stars that have planets
around them
ne is the number of planets per star that
are capable of sustaining life
fl is the fraction of planets in ne
where life evolves
fi is the fraction of fl
where intelligent life evolves
fc is the fraction of fi
that communicate
fL is fraction of the planet's life during
which the communicating civilizations live
N, the number of communicating civilizations
in the galaxy.
Try your hand at the Drake Equation. For each variable choose what you
think is the best answer from the combo box. After you've chosen all your
answers press the calculate button and see how many communicating civilizations
you think there are in the galaxy.
clipped from www.activemind.com
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