Mars the red planet
Because of the planet's cold temperature and thin atmosphere, liquid water is not stable on the Martian surface. Any water would either evaporate into the atmosphere or freeze and be absorbed into the soil.
However, there's quite a bit of evidence suggesting that water once flowed across the Red Planet. The most recent and exciting development came in December of 2006, when a new study of photographs taken from orbit suggested water flowed on Mars as recently as a few years ago.
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