NASA's Mars Exploration Rover Opportunity recorded a panoramic view before entering the upper end of a fluid-carved valley that descends the inner slope of a crater's rim.
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NASA's Mars Exploration Rover Opportunity recorded a panoramic view before entering the upper end of a fluid-carved valley that descends the inner slope of a crater's rim.
Credit: NASA For the 14th consecutive year, NASA received an unmodified, or “clean,” opinion from an external auditor on its fisca...
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