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%\section{Life and intelligence}  The interesting fact about this compact version of the Drake equation is that it only contains factors dealing with the emergence of life itself. Broadly speaking astrophysics has answered the question "Is the Universe likely to provide the right environment for life as we know it ?" with a big "yes!".   Time to deal with astrobiology.  %cradles for life as we know it are common in the universe or Next step is characterizing these worlds, and finding %trace of life.   $f_l$ \textbf{How likely is the emergence of life}?   If life was impossible nobody would know about it. Similarly, the fact that we see life on Earth can not be used to draw conclusions on how probable this is in the Universe\footnote{If Earth was the only life-hosting planet in the cosmos, we would necessarily have to be living there}.