Opportunity Rolls Free from the Dune - Universe Today
When Opportunity got its wheels stuck in a sand dune more than a month ago, operators had no idea it would be so difficult to get it moving again. So they were relieved this weekend when Opportunity finally maneuvered its way out. It was very difficult for the rover to get any traction in the ripple-shaped dune, and its spinning wheels traveled the equivalent of 191 metres (629 feet). Scientists now want to analyze the sand dune to understand why this one bogged down the rover, unlike dozens of other dunes it's rolled across without a problem.
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