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Routine inspections of Curiosity’s wheels has found new damage on the rover’s left middle wheel.
None of this is unexpected. Nor is it a serious problem. They expected the wheels to wear out over time, though I must say that it seems to me that Curiosity’s wheels, in use now for about five years, do not seem to be doing as well as Opportunity’s, working on Mars for more than a dozen years. Opportunity was only supposed to last for 90 days. Curiosity was designed to last years. Yet, it seems that Curiosity’s wheels are wearing out faster than Opportunity’s.