Spirit's "Cleaning Techniques" - Soles 416 and 426 (Approximate True Colors; credits: NASA/JPL-Caltech)

Caption NASA originale:"These 2 images from 10 days apart show that dust was removed from the PanCam's calibration target on NASA's Mars Exploration Rover Spirit. Spirit's PanCam took the picture on the left on the Rover's 416th Sol (such as March 5, 2005) and took the picture on the right on Sol 426 (such as March 15, 2005). During the time in-between, other evidence of dust-lifting winds were a jump in power output by Spirit's solar arrays on Sol 420 from removal of some accumulated dust, and sighting of two dust devils in Sol 421 images from Spirit. The size of the base plate on the calibration target shown in both of these images is 8 cm on each side".