| 摘 要： | the space age has brought spectacular advances in our knowledge of the solar system.The flyby observations of the outer planets by the Voyagerspacecraft have been crost fruitful.These discoveries are now to be supple-mented by the Galileo Oribter to Jupiter and the Cassini Orbiter to Saturn.After the successful operations of the atmospheric probe in December 1995,the Galileo spacecraft is now in orbit around Jupiter and its comprehensive scientific observations of the Jovian system have just commenced.The Cassini spacecraft with the Huygens atmospheric probe to Titan will be launched in 1937 with an arrival date at Saturn in 2004.If everything goes well,these two projects will be followed by a Pluto Express mission for fast flyby reconnaissance and a Neptune Orbiter.
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