Map of Solar System's Largest Moon (IMAGE) Brown University Caption Using images from NASA's Voyager Mission (1979) and the orbital Galileo Mission (1995), researchers have created the first global geological map of Jupiter's largest moon, Ganymede. Credit USGS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.