[anonymoose4]

Permanent. As Enceladus orbits Saturn, variances in the strength of the the gravity field causes Enceladus to contract and expand, building up heat and pressure. Since Enceladus is completely ocean covered by a thin layer of ice, the water blasts out of fissures in the surface. Some now think that some of Saturns rings have been generated over time by Enceladus ejecting water and other matter as it orbits.

[xg15]

So, it's basically the orbital equivalent of a rubber duck