> The actual pressure in the surface of Mars is 8millibars = > and the temperature max -32=BAC and min -80=BAC. Couldn't be simulated this conditions in earth?, just to = demostrate that vaporization can happen? /> AFAIR the surface temperature can rise abover 0 degrees = Celsius in places on occasion. I'm sure that they have an extremely good idea of how water = ice would be expected to behave under the condions the were = observing it in. Russell -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist