1. The irregular craggy moon Hyperion is about 170 miles across and is probably half water ice.
2. The sponge-like appearance is thought to be due, in part, to impacts from meteors, which compress the icy surface.
TAG: This October Cassini will fly within 30 miles of another Saturn moon, Enceladus (enˈselədəs), to study its icy plumes.