PIA23288: Dune Footprints in Hellas
 Target Name:  Mars
 Is a satellite of:  Sol (our sun)
 Mission:  Mars Reconnaissance Orbiter (MRO)
 Spacecraft:  Mars Reconnaissance Orbiter (MRO)
 Instrument:  HiRISE
 Product Size:  2880 x 1800 pixels (w x h)
 Produced By:  University of Arizona/HiRISE-LPL
 Other  
Information: 
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 Full-Res TIFF:  PIA23288.tif (5.191 MB)
 Full-Res JPEG:  PIA23288.jpg (1.623 MB)

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These curious chevron shapes in southeast Hellas Planitia are the result of a complex story of dunes, lava, and wind.

Long ago, there were large crescent-shaped (barchan) dunes that moved across this area, and at some point, there was an eruption. The lava flowed out over the plain and around the dunes, but not over them. The lava solidified, but these dunes still stuck up like islands. However, they were still just dunes, and the wind continued to blow. Eventually, the sand piles that were the dunes migrated away, leaving these "footprints" in the lava plain. These are also called "dune casts" and record the presence of dunes that were surrounded by lava.

Enterprising viewers will make the discovery that these features look conspicuously like a famous logo: and you'd be right, but it's only a coincidence.

The map is projected here at a scale of 50 centimeters (19.7 inches) per pixel. (The original image scale is 53.6 centimeters [21.1 inches] per pixel [with 2 x 2 binning]; objects on the order of 161 centimeters [63.4 inches] across are resolved.) North is up.

The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.

Image Credit:
NASA/JPL-Caltech/University of Arizona

Image Addition Date:
2019-06-12