Mars   , the    Red Planet   , as imaged through my 8"    Celestron    telescope from Malibu in October 2018. The bright white dot at the bottom is the    Martian    southern polar ice cap, which contains a layer of    dry ice    (frozen CO2) caked over water    ice   . In fact, the southern polar cap contains roughly 50 percent the amount of water frozen in Greenland's ice sheet. Will humans living on Mars melt and drink this water one day?