The Mars rover, Curiosity, has found evidence that a habitable freshwater lake existed on Mars for a period of up to hundreds of thousands of years. Per the article:

 

Analysis of mudstones in an area known as Yellowknife Bay, located inside the rover’s Gale Crater landing site, show that fresh water pooled on the surface for tens of thousands -- or even hundreds of thousands -- of years. “The results show that the lake was definitely a habitable environment,” Curiosity lead scientist John Grotzinger, with the California Institute of Technology, told Discovery News.

 

http://news.discovery.com/space/mars-rover-finds-ancient-life-suppo...

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Thank you for the educational article John.

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