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题目材料：
Modern radar observations indicate that the bodies making up Saturn's rings range from small grains to bodies several meters in diameter. This generates some uncertainty about the origin of the material that composes the ring system. One theory is that the orbit of a small satellite diminished until its proximity to Saturn caused it to be torn apart by the planet's tidal forces, breaking it up into bodies a few tens of kilometers in diameter. Further fragmentation by tidal forces would have been unlikely, however, since the effectiveness of tidal forces increases with the size of the body on which they act.Subsequent collisions between these initial bodies could have been the events that produced the finer material to form the rings.
以上解析由 考满分老师提供。
