Mars Rover Finds Evidence That Water Flowed On Red Planet

By Dilip -

NASA's Mars Rover Opportunity has found what scientists believe is the most convincing evidence to date that water may have flowed on the Red Planet. The rover, which has been crawling along the Martian surface for 90 months, found what appears to be veins of the mineral gypsum, a hydrated calcium sulfate that on Earth is used to make drywall.
"This tells a slam-dunk story that water flowed through underground fractures in the rock," Steve Squyres, a planetary scientist at Cornell University and the principal investigator for Opportunity said in a NASA statement. "This stuff is a fairly pure chemical deposit that formed in place right where we see it. That can't be said for other gypsum seen on Mars or for other water-related minerals Opportunity has found. It's not uncommon on Earth, but on Mars, it's the kind of thing that makes geologists jump out of their chairs."
According to NASA, the rover found several similar veins on the rim of the Endeavour crater, but scientists have homed in on a 16 to 20 inch-long strip about as wide as a thumb that they've nicknamed "homestake." The Opportunity has traveled 20 miles since it arrived on Mars in 2004, but this is the first time it has observed a mineral deposit like this..

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