The Galileo orbital mission to Jupiter (1995-2001) made significant UVS and EUV discoveries. These include finding an atomic Hydrogen atmosphere at Callisto and Ganymede, Oxygen on Callisto’s surface, Hydrogen Peroxide on the surface of Europa, SO2 and it’s daughter products from Io’s volcanoes, and the ultraviolet emissions of the ions of Sulfur and Oxygen in the Io Torus.  Jupiter’s north and south UVS and EUV aurora and the Solar Wind dynamics were also studied.

The two LASP built Galileo spectrometers, the Ultraviolet (UVS) and Extreme Ultraviolet (EUV) Spectrometers, also observed Venus, the Earth and Moon system twice, the asteroids Gaspra and Ida, and the impacts of Shoemaker-Levy fragments with Jupiter. Extensive Lyman-alpha wind observations were also obtained during the six-year cruise to Jupiter (1989-1995). Jupiter orbit insertion was December 8th, 1995.