Refined mapping tools that identify subsurface water ice on Mars will help determine the best targets for robotic and human missions to the planet. The fourth phase of NASA's Mars Subsurface Water Ice Mapping (SWIM) project has generated three maps that show ice in depths of zero to one meter, one to five meters and deeper than five meters, said Gareth Morgan, SWIM Co-Principal Investigator and Senior Scientist at the Planetary Science Institute. The project used for the first time data from
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