(4 of 6) Enceladus holds mysteries of its own. A bright white
world with a relatively smooth face, it appears to have been
repeatedly resurfaced by some kind of underground slurry or
perhaps by ice volcanoes. In some places, once deep crevasses
have been largely filled in and craters have been cut neatly in
half, leaving one side deep and raw and the other covered, as if
by snowdrifts. The area of the Saturnian ring that follows in
the wake of Enceladus is slightly thicker than the rest, as if
the moon were pumping out some kind of frozen exhaust, leaving a
plume in its wake like the smoke from a steamship. Other
questions should be answered when Cassini flies by Hyperion, a
tumbling moon that appears to have been knocked off its pins by
a collision eons ago and has never regained its footing; and
Tethys, a moon that bears such a massive impact scar that only
the barest geological margin keeps it from shattering
altogether. It is Titan, however, that will be the main
attraction. One of the largest moons in th