Space.comOpportunity Rover on Mars Takes on Its Steepest Slope YetSpace.comA shadow and tracks of NASA's Mars rover Opportunity appear in this March 22, 2016, image, which has been rotated 13.5 degrees to adjust for the tilt of the rover. The hillside descends to the left into "Marathon Valley." The floor of Endeavour Crater
...Mars Rover Tackles Steep Hill, Spins Wheels, Gives UpDiscovery News
NASA's Opportunity Rover Got Stuck on a Hill on MarsGizmodo
New exhibit lets you take a walk on Mars with Buzz AldrinThe San Diego Union-Tribune
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