... Fields of Minerals on Ganymede . ... 7.11.1996 . ... Credit: NIMS , Galileo Mission , JPL , NASA Explanation: What treasures lie on the surface of Ganymede ? Last week, NASA released a map of Jupiter's largest moon made by the Galileo Orbiter highlighting ice and minerals deposits. The leftmost photograph by Voyager shows surface features in visible light, but the rightmost photograph , taken in infrared light by Galileo, shows the locations of minerals in red and ice grains in blue. ...