Support WBURNASA Rover Stuck In Flourlike Martian SoilPlay02:57Download AudioNell GreenfieldboyceMay 20, 2009 ShareNASA's Mars rover Spirit slipped in soft ground during short backward drives in late April. Spirit used its front hazard-avoidance camera after driving to get this wide-angle view, which shows the wheel tracks in the soil. (NASA/JPL-Caltech)