[thedugal]

It's not that easy. If everything we know about Mars is accurate it is almost impossible for water to exist in liquid form on Mars.

[nightdriver]

"If everything we know about Mars is accurate it is almost impossible for water to exist in liquid form on Mars."

Exactly.

With an atmospheric pressure of from 4 to 8 millibars (it is said to vary between those values), water boils at less than 40 degF.

It would be nearly impossible for water to exist as anything but a vapor there, and we're told that the water content of the Martian atmosphere has been measured at something like 210 ppm. Pretty dry!