Found it! Ice on Mars
Tuesday, May 28, 2002
Using instruments on NASA's 2001 Mars Odyssey spacecraft, surprised
scientists have found enormous quantities of buried treasure lying just
under the surface of Mars -- enough water ice to fill Lake Michigan
twice over. And that may be only the tip of the iceberg...
More: Science@NASA - Found it! Ice on Mars
Link: USGS Astro - Mars Ice - Mars Global Surveyor Thermal Emission Spectrometer

