Quote:
Originally Posted by thrash
I'm not sure why they chose to explain it this way, rather than referring to a phase diagram directly. At the 20 millibars they estimate for total mobilizable CO2, liquid water can exist in the range of 273-293 K. This still probably isn't achievable with the terraforming technology we can envision, but it's much closer to possible.
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I think they wanted 1 bar so the surface temperature would reach 273K, not so the water wouldn't evaporate.