1684年，乔瓦尼·多米尼克·卡西尼(GiovanniDomenicoCassini)发现了土星的四颗卫星，土卫四正是其中之一，卡西尼号探测器就是以他的名字命名的。
Dione was one of four Saturnian moons discovered in 1684 by Giovanni Domenico Cassini, who the spacecraft is named after.
1684年，乔瓦尼·多米尼克·卡西尼(GiovanniDomenicoCassini)发现了土星的四颗卫星，土卫四正是其中之一，卡西尼号探测器就是以他的名字命名的。
Dione was one of four Saturnian moons discovered in 1684 by Giovanni Domenico Cassini, who the spacecraft is named after.
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