1848年美國天文學家喬治·邦德和英國的威廉·拉塞爾各自獨立發現土衛七,距土星1482000公里,像大星體的碎片,表面有如海綿,直徑大約270公里,它是太陽系中,自轉不規則的星體之一,每21.3天繞土星旋轉一周。
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