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Saturn's moon Rhea was discovered by Giovanni Cassini on December 23, 1672.

A view from Cassini toward the unilluminated side of Saturn's rings from somewhat below the ring plane. You can see Mimas (the larger moon) and Pandora. Mimas has enough mass that its gravity has pulled it together into a spherical shape. Little Pandora, on the other hand, has an irregular shape.

Credit: NASA/JPL-Caltech/Space Science Institute

NASA’s Cassini spacecraft captured this incredible view of Saturn moons, Enceladus and Tethys, in perfect alignment with the planet’s rings.

Photograph by NASA/JPL-Caltech/Space Science Institute

This is a near-true color image of Iapetus, taken by Cassini using different filters. The use of color on Iapetus is particularly helpful for discriminating between shadows (which appear black) and the intrinsically dark terrain (which appears brownish).

Iapetus is Saturn's two-toned moon, though this image is only of the northern part of dark Cassini Regio and the transition zone to a brighter surface, all on the dark side. It doesn't include any part of the bright hemisphere.

Credit: NASA/JPL/Space Science Institute

Saturn's moon Tethys seems to float between two sets of rings in this view from NASA's Cassini spacecraft, but it's just a trick of geometry. The rings, which are seen nearly edge-on, are the dark bands above Tethys, while their curving shadows paint the planet at the bottom of the image.

looks like a golfball

It looks a bit like a family portrait - except no one is making funny faces. Cassini sent this picture of Enceladus, Tethys and Mimas and the rings. Enceladus (504 km across) is just below center and Mimas (396 km across) is below left of Enceladus. The third moon, just above the rings, is Tethys (1062 km across).

This is Saturn's little moon Phoebe in a mosaic of 6 images taken by the Cassini spacecraft.

Although Phoebe is one of the darkest known bodies in the Solar System, there is also some very bright material thought to contain ice. The moon's topography is quite irregular and it's heavily cratered. It

Image Credit: NASA/JPL/Space Science Institute

Awesome!

Saturn's little moon Mimas transits Saturn's northern latitudes over shadows of the planet's rings. Saturn usually looks yellow, but it has a blue hue at the northernmost latitudes. This occurs for the same reason our own sky looks blue - it has to do with the way light is scattered at different angles.

Mimas is the smallest known body that has enough mass for its own gravity to pull it into a spheroid.

Image credit: Michael Benson using data from NASA's Cassini spacecraft in 2005.