Rare tear-shaped dark dunes in this 6.4 x 7.0 km image (frame 10004) centered near 47 degrees south, 341 degrees west, taken by NASA's Mars Global Surveyor Orbiter.

Rare tear-shaped dark dunes in this 6.4 x 7.0 km image (frame 10004) centered near 47 degrees south, 341 degrees west.

Figure caption from Science Magazine.

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