Pools of salty water might be able to exist just below the surface of Mars, planetary scientists believe.
Researchers previously thought water existed largely as ice or as vapour on Mars, because of the low temperatures and atmospheric pressure.
But Nasa's Phoenix lander has shown the presence in Martian soil of perchlorate salts, which can keep water liquid at temperatures of minus 70C.
Pockets of brine might form when soil interacted with ice.
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