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List of missions to the outer planets : ウィキペディア英語版 | List of missions to the outer planets
A total of nine spacecraft have been launched on missions that involve visits to the outer planets; all nine missions involve encounters with Jupiter, with four spacecraft also visiting Saturn. One spacecraft, Voyager 2, also visited Uranus and Neptune. The nine missions include two; Ulysses and New Horizons, whose primary objectives are not related to the outer planets, but which flew past Jupiter to gain gravity assists en route to a polar orbit around the Sun, and Pluto - at the time of its launch considered an outer planet - respectively. Cassini–Huygens also flew past Jupiter for a gravity assist on its mission to explore Saturn. Only three of the missions to the outer planets have been orbiters: Galileo orbited Jupiter for eight years, and Juno will enter orbit around Jupiter in 2016, while Cassini has been in orbit of Saturn since 2004. ==Jupiter== (詳細はJupiter, with an additional three spacecraft making gravity-assist flybys without the exploration of Jupiter being one of their primary objectives. :''Missions whose primary objectives were not related to the exploration of Jupiter are indicated in grey''
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