NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY
Boulder on Mars. Satellite image of an irregular upright boulder on the surface of Mars. A path resembling a dotted line from the upper left to middle right of this image is the track left by the irregularly shaped, oblong boulder as it tumbled down a slope on Mars before coming to rest in an upright position at the downhill end of the track. The boulder's trail down the slope is about 500 metres long. The trail has an odd repeating pattern, suggesting the boulder could not roll straight due to its shape. Imaged by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter, on 3rd July 2014.
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