Enceladus, moon of
One of the innermost moons of Saturn, Enceladus
is believed to have ice geysers which may be
responsible for sustaining Saturn's E ring's supply of micrometer-sized particles.
At some depth beneath the surface,
the temperatures are possibly hot enough for water to become liquid, which then,
under pressure, escapes to the surface in a geyser. The surface of
also cross-cut by numerous faults. Produced as a postcard.