NASA/JPL/Malin Space Science Systems
On some fine-grained martian slopes, rolling boulders make tracks. This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows an example of boulder tracks on a crater wall near 35.8°S, 158.5°W. Sunlight illuminates the scene from the upper right; the 150 m scale bar is also about 492 feet long.
Malin Space Science Systems and the California Institute of Technology built the MOC using spare hardware from the Mars Observer mission. MSSS operates the camera from its facilities in San Diego, California. The Jet Propulsion Laboratory's Mars Surveyor Operations Project operates the Mars Global Surveyor spacecraft with its industrial partner, Lockheed Martin Astronautics, from facilities in Pasadena, California and Denver, Colorado.