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'Face' on Mars. Viking 1 Orbiter photograph of surface features in the northern latitudes of the planet Mars. The photograph shows eroded mesa- like land formations. The huge rock formation resembling a human head is formed by shadows giving the illusion of eyes, nose and mouth. It is 1.5 kilometres (1 mile) across. The speckled appearance of the image is due to 'bit errors', which are exaggerated by the enlargement of the photograph. The picture was taken on July 25, 1976. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA) === , ===