Today, Mars is a frozen world. theaverage temperature here Is lower thanat the Earth's South Pole. But long ago,when water may have flowed here, itmust have been warmer. We don t knowwhy Mars turned so cold, but perhaps itcould be made to change once againCould future generations somehowtransform mars into an earth-like worldwhere people could live? What would lifebe like on Mars? Perhaps we could buildfarms and cities. Or perhaps we will leaveMars as we found it. those decisions willbe made by our descendants