\textbf{100- There is enough information in the passage to answer which of the following questions?}
\begin{enumerate}
\item[1)] How many planets are there in our galaxy?
\item[2)] How can Nasa reduce the cost of the Kepler mission?
\item[3)] What characteristics does a planet need to have in order to be able to support life?
\item[4)] Will we be sad if we discover we are alone in our galaxy or happy if we find that we share it with other life forms?
\end{enumerate}