deletions | additions       diff --git a/Intro.tex b/Intro.tex  index 3e7586a..ffb4862 100644  --- a/Intro.tex  +++ b/Intro.tex 
...
\item How common are planets?  \item How common are planets similar to Earth?  \end{enumerate}  It is clear that the answer to these questions have a profound impact not only for astrophysics, but more generally on the