Rather than water flows like those on Earth, these Martian gullies were likely created by dry ice defrosting, a duo of French scientists wrote in the journal Nature Geo science.
    
"The role of liquid water in gully formation should be reconsidered, raising the question of the importance of its occurrence in Mars' recent past," wrote Francois Forget and Cedric Pilorget of the French national research institute CNRS.
    
They said their findings held no implications for the headline-making announcement in September that dark lines running down slopes in the tropics of Mars in summer, may be streaks of super-salty brine hinting at the presence of life-sustaining water.
    
Monday's paper dealt with unrelated geological features in a different part of the planet, mainly in the mid-latitude range between 30 and 60 degrees on pole-facing cold slopes, said the French team.

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