Until the 2009 collision, the last known impact event on Jupiter was the famous "death" of Comet Shoemaker-Levy9 in 1994.
2009年的碰撞之前，上一次已知的碰撞木星事件是著名的1994年苏梅克·列维9号彗星的死亡碰撞。
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That’s been observed twice before, when comet Shoemaker-Levy9 crashed into Jupiter in July 1994, and when a large asteroid smacked the planet last summer.