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Matteo Cantiello edited Equation.tex
about 10 years ago
Commit id: 51d37b5663100990fc51b9b1a008fdb1e5791692
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where $N$ is the number of civilizations in the Milky Way Galaxy with whom we could make contact.
$R$ is the rate of star formation, which tells how many stars are born every year in our Galaxy.
$n_e$ is the average number of habitable planets in any planetary system
All $f$ termn are factors $\le 1$, corresponding to
\begin{itemize}
\item $f_p$ is the fraction of stars that have planets
\item $f_l$ is the fraction of planets where life actually begins
\item $f_i$ is the fraction of life-forms that develop intelligence
\item $f_i$ is the fraction of intelligent civilization that decide to communicate
\end{itemize}
Finally $L$ is the longevity of a communicative civilization (in years). In the case of humankind L is, so far, just a few decades.