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伽利略号探测器由美国宇航局于1989年10月28日发射,1995年12月7日飞抵木星。设计时,预计工作期为两年,1998年以后,它即处于“超期服役”状态。这次对木星的四大卫星之一(?)(?)(木卫一)的近距离考察是它“超期服役”使命的一个组成部分。
The Galileo probe was launched by NASA on 28 October 1989 and arrived on Jupiter on 7 December 1995. The design is expected to work for two years, after 1998, it is in the “extended service” state. This close examination of one of the four satellites of Jupiter (?) (?) (Io) is an integral part of its “extended service” mission.