The twin Voyager spacecraft were launched in 1975 to conduct studies of Jupiter, Saturn, Saturn's rings, and the larger moons of both planets. The five year mission was extended multiple times, allowing the spacecraft to explore not only Jupiter and Saturn, but also Uranus, Neptune, and a total of 48 of the gas giants' moons. USGS scientist, Larry Soderblom, played an intregal role on the mission as a lead member of the Imaging Team. In addition, data from the Voyager mission has been used in numerous maps, products, and research delivered by the USGS Astrogeology Team.