Conversation so far:
which one of saturn's moons has water
Measurements of Enceladus's libration as it orbits Saturn suggests that the entire icy crust is detached from the rocky core and that a global ocean is present beneath the surface.
how big is enceladus
Enceladus is about 500 kilometers in diameter.
what is enceladus named after
Enceladus is named after the giant Enceladus of Greek mythology.
how many moons does saturn have
At least 82 moons are known to orbit Saturn, of which 53 are officially named; this does not include the hundreds of moonlets in the rings.

Question: what's the planet's largest moon
Self-contained rewrite: what's saturn's largest moon