deletions | additions       diff --git a/Parameters.tex b/Parameters.tex  index d347121..9628f97 100644  --- a/Parameters.tex  +++ b/Parameters.tex 
...
\section*{Estimating the terms in the Drake equation} $R$ is $R$,  the \textbf{rate of star formation}, telling tells  how many stars are born every year in our Galaxy. This number is about 10 and might seem quite small, but the Galaxy is about 10 billion years old, so plenty of stars have born (and died) in the meanwhile.\\ meanwhile. So  $R\approx 10$     The other terms 10$. It's interesting to note that  in the 1961, when  Drake equation were not known in 1961. Actually till wrote his equation, this was  the early '90s only factor known. Today  wedidn't even  know if planets were a unique feature of the Solar system. much more.