Although Janus should be the least lonely of all moons -- sharing its orbit with Epimetheus -- it still spends most of its orbit far from other moons, alone in the vastness of space in this image from NASA's Cassini spacecraft.
Not all of Saturn's rings are created equal: here the C and D rings appear side-by-side, but the C ring, which occupies the bottom half of this image, clearly outshines its neighbor. This image is from NASA's Cassini spacecraft.
Although we are used to seeing Saturn's moons lit directly by the Sun, sometimes we can catch them illuminated by 'Saturnshine.' Here, NASA's Cassini spacecraft see Mimas (upper right) lit by light reflected off of Saturn.
NASA's Cassini spacecraft stared toward Saturn's two-toned moon Iapetus for about a week in early 2015, in a campaign motivated in part to investigate subtle color differences within the moon's bright terrain.
NASA's Cassini captured these views of Saturn's icy moon Rhea on Feb. 9. The spacecraft returned to equatorial orbits around Saturn in March after nearly two years, allowing the mission to once again have close encounters with moons other than Titan.
The moon Iapetus, like the 'force' in Star Wars, has both a light side and a dark side. Scientists think that Iapetus' dark/light asymmetry was actually created by material migrating away from the dark side.
Named after a Japanese paradise, NASA's Cassini spacecraft spies the Senkyo region of Titan), a bit less welcoming than its namesake with a very inhospitable average temperature of approximately 290 degrees below zero Fahrenheit (-180 degrees Celsius).
Many color images are taken by NASA's Cassini spacecraft in red light so scientists can study the often subtle color variations of Saturn's rings. These variations may reveal clues about the chemical composition and physical nature of the rings.
Two masters of their craft are caught at work shaping Saturn's rings captured by NASA's Cassini spacecraft. Pandora (upper right) sculpts the F ring. Meanwhile, Daphnis is busy holding open the Keeler gap (bottom center).
NASA's Cassini orbiter shows that Tethys appears to be peeking out from behind Rhea, watching the watcher. Scientists believe that Tethys' surprisingly high albedo is due to the water ice jets emerging from its neighbor, Enceladus.
Nature is an artist, and this time she seems to have let her paints swirl together a bit. What the viewer might perceive to be Saturn's surface captured by NASA's Cassini orbiter is really just the tops of its uppermost cloud layers.
The moons visible in this image from NASA's Cassini spacecraft, Pandora and Atlas, are quite small by astronomical standards, but the rings are also enormous. From one side of the planet to the other, the A ring stretches over 170,000 miles (270,000 km).
NASA's Cassini spacecraft captures a rare family photo of three of Saturn's moons that couldn't be more different from each other. Shown here are Tethys (center), Hyperion (upper left), and Prometheus (lower left).