Shifting sand dunes on ancient Mars once concealed a network of underground water spread across an area the size of Oklahoma, according to new findings from NASA's Mars rover Opportunity.

The new findings confirm suspicions that water once shaped the Martian landscape on a regional scale instead of forming isolated oases, said rover project leader Steven Squyres of Cornell University in New York State.

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From the Upcoming ueue, submitted by sunnyspeaks.