deletions | additions       diff --git a/introduction_1.tex b/introduction_1.tex  index 34bd246..e422a7c 100644  --- a/introduction_1.tex  +++ b/introduction_1.tex 
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\item How to distinguish moons from artificial satellites? (adopt combination of polarization and transit signature)  \item Spectra?  \item Test: signal from International Space Station as seen from 10 pc  \item Literature. Need somebody from the field (Exoplanets) that can point to the {\bf  relevant literature }  \end{enumerate}