Scientists suspected cryovolcanism, and that was confirmed quite dramatically in 2005 when Cassini spotted active geysers of water spewing from the south pole of Enceladus!

科学家们曾怀疑木卫二也有冰火山，戏剧性的是，这随后被2005年卡西尼号观测到的土卫二南极喷发的活动间歇泉所证实。