Reuters/NASA/JPLMARCH 24, 2017 —It’s not easy off-roading on an alien planet. Harsh conditions abound, and you can’t call AAA if you get a flat. NASA’s car-sized Curiosity rover continues to experience exactly these challenges. A routine inspection on March 19 uncovered two breaks in the raised ribs that reinforce the left-middle wheel’s delicate skin, further evidence of the wear and tear that has been a constant challenge for the mission. Scientists say the unwelcome discovery doesn’t jeopardize scientific goals, but it underscores the need for continued careful driving and perhaps some creative thinking. "All six wheels have more than enough working lifespan remaining to get the vehicle to all destinations planned for the mission," said Curiosity project manager Jim Erickson in a press release.

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