Curiosity rover finds evidence that small amounts of liquid water exist on Mars

Liquid water lurks just below the surface of Mars on cold winter nights, according to new research. The Mars Curiosity rover has found evidence that when temperatures drop on cold winter nights, trace amounts of water from the atmosphere can turn to frost, which can then be absorbed into the upper layers of the Martian soil and liquefied. The liquid water evaporates back into the atmosphere after sunrise, when temperatures start to go up again. SEE ALSO: Photos: The search for water on Mars Turn...