NASA's Spirit looks for water signs
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Spirit is inspecting a 3-inch deep trench, created by its left front wheel in this image taken Saturday.
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LOS ANGELES, California (AP) -- NASA's Spirit rover continued probing a tiny martian trench Sunday that may yield clues about whether there ever was water in the area, and was set to begin a 445-foot drive to a crater.
The rover was sending back data from a 3-inch trench it studied with a microscopic imager and a Mossbauer spectrometer, an instrument that measures the composition and abundance of iron-bearing minerals.
Scientists hope the minerals show whether the Red Planet's environment once held water to support life. Spirit dug the trench by running its front wheel over the planet's surface.
The robot was expected to begin driving early Monday toward a crater nicknamed "Bonneville," a depression more than 650 feet wide.
It will stop about midway at the edge of the area scientists are currently able to see and characterize.
"We don't want to blindly keep moving on," said mission manager Jim Erickson from NASA's Jet Propulsion Laboratory in Pasadena.
Spirit's twin, meanwhile, was investigating a rock dubbed "El Capitan," part of a rocky outcropping on the other side of Mars.
The Opportunity rover will remain at El Capitan over the next several days, taking images and using its rock abrasion tool, known as a "rat," on at least three separate areas.
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