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土星(拉丁語:Saturnus)是太陽系中距離太阳第六近的行星,其體積僅次於木星,為太陽系第二大行星。作為氣體巨行星,土星平均半徑約為地球的9倍,但密度僅地球的八分之一,質量卻達地球的95倍以上。儘...