For the first time, scientists have found that water ice lies at variable depths over small-scale patches on the Red Planet. The discovery draws a much more detailed picture of underground ice on Mars than was previously available. The new results appear in the May 3, 2007, issue of the scientific journal „Nature“. The findings come from data sent back to Earth by the Thermal Emission Imaging System (THEMIS) on NASA’s Mars Odyssey orbiter.
NASA – Sharp Views Show Ground Ice on Mars Is Patchy and Variable
JPL – Sharp Views Show Ground Ice on Mars Is Patchy and Variable