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成環之因有三:
環者多弗穩矣,歷千萬、數億年迨沒,然土星環甚古矣。[4]。
環內之微粒者,或矽酸鹽、或冰粒、或岩石、卵石。
間可察「牧羊犬」衛星,乃環之外緣、環內縫隙之小衛星。 其引力劃環之界;近物或吸進環內,或被逐,或吸進衛星。
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