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In the \href{https://www.authorea.com/users/2/articles/24715/_show_article}{previous post} we discussed how likely is (intelligent) extraterrestrial life to emerge in the Universe. I have shown that, using the most recent findings in astrophysics and some astrobiology arguments, one can estimate greatly simplify  the Drake equation. The  number of communicative civilizations in our Galaxy. This Galaxy  turns out  to beis  the product of the chance of emergence of intelligent life $f_i$ times the average lifetime $L$ of a civilization's communicative phase. \begin{quote}  $N \approx \, \frac{1}{4}\, f_i \, L $.