Water CAN easily remain liquid under Martian condtions. We’ve been able to see it in that form down there since at least 2001.
Water heavily salted with, say, calcium chloride, could remain liquid down past -50
C (-60 F). Magnesium sulfate (epsom salt) and calcium sulfate (gypsum), both
suspected now known
to be abundant in Martian soil, can depress water's freezing point to -35
C and -55 C respectively; but a mixture of the two can bring this all the way down
to -63 C (-81.4 F). Maximum summer temperatures in the south polar area reach -5 C
(+23 F) and so, strangely enough, briny water could indeed survive as a liquid
during part of the year there. In order for water to boil under Martian pressure it
needs to reach 10 C (50 F).
10.03.01 Apparent pool of standing liquid on a crater floor southeast of Argyre Planitia near Darwin. And what are those things clustering in it?
24.03.01 Hold the presses: another crater pond with “floaters.” And this time we can see things more clearly.
09.04.01 Near Crater Lau, another pond with ever stranger “floaters”
19.04.01 Horseshoe-shaped crater pond near Chamberlin
04.05.01 An Art Nouveau crater pond?
16.05.01 Four more new ones
28.05.02 They cluster where the water is.
28.07.05 Beautiful color shot by Mars Express of frozen crater pond (northern hemisphere, unlike ponds above near the south pole)
Mars stereographic projection map showing the context of some of the above locations
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