Both polar caps on Mars are composed of many layers of ice and dust. This image from NASA's Mars Odyssey clearly shows the layering of the North polar cap.

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Sand dunes form large fields, called ergs, around the north polar cap of Mars. This image shows are region of dunes at the cap margin.

Orbit Number: 37561 Latitude: 83.6274 Longitude: 120.898 Instrument: VIS Captured: 2010-06-03 02:28

Please see the THEMIS Data Citation Note for details on crediting THEMIS images.

NASA\'s Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA\'s Science Mission Directorate, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.\n

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