January 2002, due to a problem with the pointing system. The last operational reaction wheel on FUSE stopped on 12 July 2007. Attempts to restart any of the reaction wheels were unsuccessful. Although the telescope itself remained in excellent condition, the satellite was incapable thereafter of the fine pointing control required to acquire useful science data, and the mission was terminated. Science results Over 400 scientific papers have been written using data from FUSE, with subjects ranging from cool stars to the intergalactic medium. One of the primary science goals of FUSE was to study the abundance of deuterium, an isotope of hydrogen. Because of the large number of atomic absorption and emission lines in the far-ultraviolet, FUSE enabled many studies of galactic, extragalactic, and intergalactic chemistry and chemical evolution. Impacts Canada credits work on the FUSE as helping them prepare for making the fine guidance sensors instrument on the James Webb Space Telescope. Canada's contribution is called FGS/NIRISS and is a combined Fine Guidance Sensor, spectrograph, and Far Ultraviolet Camera/Spectrograph. See also Cosmic Origins Spectrograph, instrument on the Hubble Space Telescope from 2009 which operates down to 90 nm References External links FUSE website at Johns Hopkins University FUSE website at Institut d'Astrophysique de Paris FUSE archive at Multimission Archive at STScI (MAST) Spacecraft launched in 1999 2007 disestablishments Satellites orbiting Earth Explorers Program Space telescopes Ultraviolet telescopes Spacecraft launched by Delta II rockets