Last updated on April 20, 2014 at 14:04 EDT
Ripples in the Ripples
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Ripples in the Ripples

August 21, 2004
This image taken by the Mars Exploration Rover Opportunity shows the dunes that line the floor of Endurance Crater. Small-scale ripples on top of the larger dune waves suggest that these dunes may have been active in geologically recent times. The image was taken by the rover's panoramic camera on sol 198 (Aug. 14, 2004).