1-PIA24763-MRO Spots Clays and Ice.jpg

Mars South Pole NASA/JPL-Caltech/University of Arizona/JHU This image taken by UArizona's HiRISE camera on NASA's Mars Reconnaissance Orbiter shows ice sheets at Mars' south pole. The spacecraft detected clays near this ice; scientists have proposed that such clays are the source of radar reflections previously interpreted as liquid water.