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题目材料：
Saturn's moon Enceladus shows signs of geological activity concentrated in the south polar terrain, where surface fractures emit plumes of water vapor and large amounts of heat. Tides influenced by orbital eccentricity might explain this phenomenon given the correlation between observed plume brightness and Enceladus' Orbital position. However, there is a significant delay between apocenter (maximum distance from Saturn) and peak brightness. In order to explain this, one must invoke the unknown viscosity of Enceladus' crust. Even then we don't know why geysers occur only at the south pole or how so small a body can lose all that heat into space without freezing and thus ending the activity. Existing models predict that heat would be lost faster than it is produced by tidal friction.
以上解析由 考满分老师提供。
