Two tiny moons of Saturn, almost lost amid the planet's enormous rings, are seen orbiting in this image from NASA's Cassini spacecraft. Pan, lower-right, is in the process of overtaking the slower Atlas, visible at upper-left.
Dione reveals its past via contrasts in this view from NASA's Cassini spacecraft. The features visible here are a mixture of tectonics (bright, linear features and impact cratering) the round features, which are spread across the entire surface.
Saturn's moons Tethys and Hyperion appear to be near neighbors in this view from NASA's Cassini spacecraft, even though they are actually 930,000 miles apart here. Tethys is the larger body on the left.
Rhea, like many moons in the outer solar system, appears dazzlingly bright in full sunlight. This is the signature of the water ice that forms most of the moon's surface, as seen by NASA's Cassini spacecraft.
Pan and moons like it have profound effects on Saturn's rings. The effects can range from clearing gaps, to creating new ringlets, to raising vertical waves that rise above and below the ring plane, as seen by NASA's Cassini spacecraft.
NASA's Cassini spacecraft spies a bright disruption (features known as 'jets') in Saturn's narrow F ring suggesting it may have been disturbed recently, though not by Pandora which lurks nearby at lower right.
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.