Martian Clays Tell Story of a Wet Past ...Mars Today: 5 views since Friday, August 8, 2008 at 12:53 PMLayers of clay-rich rock have been found in Mars' Mawrth Vallis, a potential landing site for future rovers. This work, published in the August 8 issue of Science, suggests that abundant water was once present on Mars and that hydrothermal activity may have occurred.
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