This scene from NASA's Mars Exploration Rover Opportunity looks upward at "Knudsen Ridge" from the valley below.
Credit: NASA/JPL-Caltech/Cornell Univ./Arizona State Univ.
NASA's senior Mars rover, Opportunity, is working adeptly in some of the most challenging terrain of the vehicle's 12 years on Mars, on a slope of about 30 degrees.
From Jet Propulsion Laboratory/NASA
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