土卫三号仅为左下方的一个小片。
科学家们认为土卫二冰火山的活跃时间只占其寿命时间的1%到20%，幸运的是，卡西尼号飞越土卫二的时候正好赶上了喷发期。
Scientists believe the cryovolcanism on Enceladus has only been active during 1 to 20 percent of its existence. We’re glad Cassini caught it in an eruptive phase.
卡西尼号土星探测器最近发现了可能能够证明在冰冷的土星卫星土卫二的地下存在着地下海洋的确切的证据。
The Cassini spacecraft has found what may be the strongest evidence yet that Saturn's tiny moon Enceladus has an ocean beneath its icy surface.
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