![]() The Red Planet's atmosphere is both cold and thin, which means water usually freezes on Mars, and is not found in either liquid or vapor form. It has long been a mystery how liquid water could form on the surface of Mars. "By studying the formation of liquid water on Mars, we can learn about possibilities of life outside Earth and look for resources for future missions," lead study author Erik Fischer, a planetary scientist at the University of Michigan at Ann Arbor, said in a statement. The robotic explorer found that each cubic foot of Martian dirt (0.03 cubic meters) contains about 2 percent water. ![]() In September 2013, NASA's Mars rover Curiosity discovered water locked up in the planet's surface soil. Observations of the Red Planet suggest water once flowed on the surface of Mars, such as the gullies found running down crater rims. ![]()
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