Mars clay, not water. Bob Zimmerman,

Jul 31, 01:10 AM
Photo: This image taken by NASA’s Mars Reconnaissance Orbiter shows ice sheets at Mars’ south pole. The spacecraft detected clays nearby this ice; scientists have proposed such clays are the source of radar reflections that have been previously interpreted as liquid water. 
Credit: NASA/JPL-Caltech/University of Arizona/JHU

Mars clay, not water.  Bob Zimmerman,