[Beowulf9]

Without an atmosphere what would happen if the water were on the surface?

[Campion]

Mars has an atmosphere, but it’s too thin to keep liquid water from boiling away. (Water boils a bit over 60,000 ft on earth; the Martian atmosphere has the same pressure as earth’s at 100,000 ft.)

[butlerweave]

You would have to create a artificial magnetosphere because mars has no magnetosphere

[iluvschnitzle]

freeze?

[aimhigh]

Without an atmosphere what would happen if the water were on the surface?

If you put a glass of water in a vacuum chamber and lower the atmospheric pressure, the water will boil away, regardless of the temperature.