... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... News . ... Spacecraft finds new evidence for water ice on Mercury . The new data indicate that the water ice in Mercuryт??s polar regions, if spread over an area the size of Washington, D.C., would be more than 2 miles thick. ... A NASA spacecraft studying Mercury has provided compelling support for the long-held hypothesis that the planet harbors abundant water ice and other frozen volatile materials within its permanently shadowed polar craters. ...