土卫一

土卫一位于最右侧光环附近，紧贴着土星盘面。

Small moon Mimas is just touching Saturn 's disk near the ring plane at the far right .

土星的卫星土卫一和太阳系最大小行星谷神星也被认为拥有次表层海洋，但科学家尚不能确定这两颗星球上的海洋有多大。

Mimas , a moon of Saturn , and Ceres , the largest asteroid in the Solar System , are also thought to have subsurface oceans - but scientists aren 't yet sure how big each one might be .

科学家将此次研究结果刊登于《科学》（Science）杂志，称土卫二在一片18至24英里（29至39公里）厚的冰面下方存有液态水。

The scientists , who reported their work in Science , said the moon has a reservoir of water beneath a sheath of ice 18 to 24 miles thick .

在土星诸多的卫星中，和那充满碳氢化合物的兄弟土卫六不同，土卫二作为又一颗可能存在液态水的星球，引得整个天文界对它众说纷纭。

Enceladus , another of Saturn 's many moons , has the astronomy world abuzz with its potential to hold water , unlike its hydrocarbon-rich sister .

土卫二为何如此活跃还是个未解之谜，因为与土卫二毗邻、大小相近的土卫一似乎寂若死灰。

Why Enceladus is active remains a mystery , as the neighboring moon Mimas , approximately the same size , appears quite dead .