NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY
Martian terrain. Coloured satellite image of the surface of Mars in the southern hemisphere. The surface is marked with numerous dark trails of unknown origin. A raised ridge (upper right) is a common landform on Mars and was formed when layers of rock and sediment break and fold under compression. Image obtained by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) on 17th June 2009. The width of this image is roughly 1.2 kilometres across.
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