地球质量高达60万亿亿吨，为什么还能悬浮在太空，不会向下坠落？【宇宙探索未解之迷】
Synopsis
地球是太阳系内侧的第三颗行星，也是内地行星中质量和密度最大的，其直径长达12756 km，质量更是高达60万亿亿吨。那么地球 ...
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