Epimetheus, seen here by NASA's Cassini spacecraft, with Saturn in the background, is lumpy and misshapen, thanks in part to its size and formation process. Bombardment over the eons has left this tiny moon's surface heavily pitted.
At first glance, Saturn's rings appear to be intersecting themselves in an impossible way. In actuality, this view from NASA's Cassini spacecraft shows the rings in front of the planet, upon which the shadow of the rings is cast.
A sinuous feature snakes northward from Enceladus' south pole like a giant tentacle in this image from NASA's Cassini spacecraft. This feature, is actually tectonic in nature, created by stresses in Enceladus' icy shell.
It's difficult to get a sense of scale when viewing Saturn's rings, but the Cassini Division (seen here between the bright B ring and dimmer A ring) is almost as wide as the planet Mercury as seen by NASA's Cassini spacecraft.
Two moons hover above the rings from this perspective, Enceladus (313 miles or 504 kilometers across), at left, and Janus (111 miles or 179 kilometers across), at right as seen by NASA's Cassini spacecraft.
he view from NASA's Cassini spacecraft looks toward the anti-Saturn sides of Tethys and Rhea. North on both moons is up. Rhea and Tethys are medium-sized moons that are large enough to have pulled themselves into round shapes.
NASA's Cassini spacecraft captured Enceladus above the rings and Rhea below. The comparatively tiny speck of Atlas can also be seen just above and to the left of Rhea, and just above the thin line of Saturn's F ring.
Dione's beautiful wispy terrain is brightly lit alongside Saturn's elegant rings in this image captured by NASA's Cassini spacecraft. The 'wisps' are relatively young fractures on the trailing hemisphere of Dione's icy surface.
Enceladus dramatically displays the contrast between its older and newer terrain as seen by NASA's Cassini spacecraft. This view looks toward the anti-Saturn side of Enceladus. North on Enceladus is up and rotated 36 degrees to the right.
Like a cosmic bull's-eye, Enceladus and Tethys line up almost perfectly for NASA's Cassini. Since they are also at relatively similar distances from the spacecraft, their apparent sizes in this image are a good approximation of their relative sizes.
NASA's Cassini spacecraft captured this view of Saturn's moon Epimetheus (116 kilometers, or 72 miles across) during a moderately close flyby on Dec. 6, 2015. This is one of Cassini's highest resolution views of the small moon.
NASA's Cassini spacecraft spied details on the pockmarked surface of Saturn's moon Prometheus (86 kilometers, or 53 miles across) during a moderately close flyby on Dec. 6, 2015. This is one of Cassini's highest resolution views of Prometheus.