The Voyager spacecraft flew by Saturn and saw Enceladus as an icy body. Because there were not many craters on the surface, people suspected that there must be some kind of resurfacing going on.

In 2004, the Cassini spacecraft arrived and took the first close-up pictures of Enceladus.

http://photojournal.jpl.nasa.gov/

Surprisingly, Enceladus' surface has the same kind of canyons, crevices, and cracks that Europa's does!

Could this mean that there is another moon with a subsurface water ice layer?

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