NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY
Noctis Labyrinthus, Mars. Coloured satellite image of exposed layers on the valley walls of Noctis Labyrinthus on Mars. The white and grey patches (middle right) are thought to contain iron-bearing sulphates and phyllosilicates. The formation of these minerals is strongly associated with the presence of water. The deposits are surrounded by wind-blown sand dunes. Image obtained by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) on 18th August 2009. The width of this image is roughly 1.2 kilometres across.
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