Water has been discovered in the fine-grained soil on the surface of Mars, which could be a useful resource for future human missions to the red planet, according to measurements made by Nasa's Curiosity rover.
Each cubic foot of Martian soil contains around two pints of liquid water, though the molecules are not freely accessible, but rather bound to other minerals in the soil.
The Curiosity rover has been on Mars since August 2012, landing in an area near the equator of the planet known as Gale Crater.
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Curiosity finds water on Mars! 2% of the soil weight is water
