NASA Study Of Clay Minerals Suggests Watery Martian Underground.

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Source:  NASA RELEASE : 11-369

Excerpt: ...A new NASA study suggests if life ever existed on Mars, the longest lasting habitats were most likely below the Red Planet's surface. ...A new interpretation of years of mineral-mapping data … suggests Martian environments with abundant liquid water on the surface existed only during short episodes. …Discovery of clay minerals on Mars in 2005 indicated the planet once hosted warm, wet conditions. …This new study supports an alternative hypothesis that persistent warm water was confined to the subsurface and many erosional features were carved during brief periods when liquid water was stable at the surface. 

 www.nasa.gov/home/hqnews/2011/nov/HQ_11-369_Martian_Clay.html

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