• Satellite finds huge ice deposits on Mars' south pole
• Ice 2.3 miles thick in some areas
• Appears to be frozen water covered by layer of frozen CO2
• If melted, ice would cover planet with 36 feet of water
http://www.cnn.com/2007/TECH/space/0...eut/index.html
This is a significant discovery. Any future colony would need a good-sized source of water. Also, in the far-off future, it would probably be good for any terraforming effort if there was already a good amount of water.