1848年美国天文学家乔治·邦德和英国的威廉·拉塞尔各自独立发现土卫七,距土星1482000公里,像大星体的碎片,表面有如海绵,直径大约270公里,它是太阳系中,自转不规则的星体之一,每21.3天绕土星旋转一周。
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