Spirit rover's wheels stuck in soft Martian dirt

(PhysOrg.com) -- The five wheels that still rotate on NASA's Mars Exploration Rover Spirit have been slipping severely in soft soil during recent attempts to drive, sinking the wheels about halfway into the ground.

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<p><a href="http://www.physorg.com/news161316655.html">Spirit rover's wheels stuck in soft Martian dirt</a></p> <p>(PhysOrg.com) -- The five wheels that still rotate on NASA's Mars Exploration Rover Spirit have been slipping severely in soft soil during recent attempts to drive, sinking the wheels about halfway into the ground.</p>