已飞240亿公里，旅行者一号的动力来自哪里，为何不会被碰撞？
Synopsis
旅行者一号是人类飞行最远的人造探测器，自1977年发射以来，已经在太空中航行了四十年多年，目前到达距离地球240亿公里的 ...
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