NASA's Mars rover Curiosity cut a wheel scuff mark into a wind-formed
ripple at the "Rocknest" site to give researchers a better opportunity
to examine the particle-size distribution of the material forming the
ripple. The rover's right Navigation camera took this image of the scuff
mark on the mission's 57th Martian day, or sol (Oct. 3, 2012), the same
sol that a wheel created the mark. For scale, the width of the wheel
track is about 16 inches (40 centimeters).
Image Credit: NASA/JPL-Caltech
Image Credit: NASA/JPL-Caltech
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