PIA07146: Nearly-defrosted Dunes
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Global Surveyor (MGS)
 Spacecraft:  Mars Global Surveyor Orbiter
 Instrument:  Mars Orbiter Camera (MOC)
 Product Size:  512 x 1445 pixels (w x h)
 Produced By:  Malin Space Science Systems
 Producer ID:  MOC2-948
 Full-Res TIFF:  PIA07146.tif (740.8 kB)
 Full-Res JPEG:  PIA07146.jpg (143.7 kB)

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Original Caption Released with Image:

22 December 2004
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a group of north polar dunes in late spring, just before the final patches of wintertime frost sublimed away. The dunes beneath the frost are dark because they contain minerals rich in reduced (unoxidized) iron. The dune slip faces (the steepest slopes on the dunes) point toward the upper right (northeast), indicating that the dominant winds involved in sand transport in this region blow from the lower left (southwest). These dunes are located near 76.3N, 261.1W. The image covers an area about 3 km (1.9 mi) wide and sunlight illuminates the scene from the lower left.

Image Credit:
NASA/JPL/Malin Space Science Systems

Image Addition Date:
2004-12-22