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In the previous post \href{https://www.authorea.com/users/2/articles/24715/_show_article}{previous post}  we discussed the chance of the emergence of (intelligent) extraterrestrial life in the Universe. I have shown that, using the most recent findings in astrophysics and some astrobiology arguments, one can estimate the number of communicative civilizations in our Galaxy. This turns to be is 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 $.