Rhea's trailing hemisphere shows off its wispy terrain on the left of this image taken by NASA's Cassini spacecraft which includes Saturn's rings in the distance.
The Cassini spacecraft looks toward Rhea's cratered, icy landscape with the dark line of Saturn's ringplane and the planet's murky atmosphere as a background. Rhea is Saturn's second-largest moon, at 1,528 kilometers (949 miles) across.
This global digital map of Rhea was created using data taken during NASA's Cassini and Voyager spacecraft flybys. This map contains data from Cassini's Jan. 11, 2011, flyby of Rhea. Six Voyager images fill gaps in Cassini's coverage of the north pole.
NASA's Cassini spacecraft looks past the cratered south polar area of Saturn's moon Rhea to spy the moon Dione and the planet's rings in the distance. Dione's 'wispy' terrain can be seen on the trailing hemisphere of that moon.
The small moon Mimas passes in front of the larger moon Rhea which is partly obscured by Saturn's rings in this image from NASA's Cassini spacecraft. Go to the Photojournal to view the animation.
A pair of Saturn's many moons joins the planet in this scene captured by NASA's Cassini spacecraft. Tethys appears as a small white dot above the rings on the far left, Enceladus appears as a smaller bright speck beside the planet.
Rhea and Dione seem like dark and light fraternal twins in this image from NASA's Cassini spacecraft, with each of these two Saturnian moons displaying a large crater oriented similarly in the northern hemisphere.
On its fourth and final targeted flyby of Rhea, NASA's Cassini spacecraft provided this stunning view of the ancient and heavily cratered surface. Billions of years of impacts have sculpted Rhea's surface into the form we see today.
The northern and southern hemispheres of Rhea are seen in these polar stereographic maps, mosaicked from the best-available NASA Cassini and Voyager images. Six Voyager images fill in gaps in Cassini's coverage of the moon's north pole.
Rhea joins other Saturnian moons in casting a shadow on the rings as the planet approached its August 2009 equinox in this image taken by NASA's Cassini spacecraft's wide-angle camera.
A pair of small moons join Saturn's second largest moon in this NASA Cassini spacecraft image spotlighting Rhea in front of the rings. Janus is seen beyond the rings on the right and Prometheus is visible between the main rings and thin F ring on left.
The northern and southern hemispheres of Saturn's moon Mimas are seen in these polar stereographic maps, mosaicked from the best-available NASA's Cassini and Voyager images.
Saturn's moon Rhea is gently lit in front of a background of the planet with a wide shadow cast by the rings which are seen nearly edge-on in this image captured by NASA's Cassini spacecraft.
The surface of Saturn's moon Rhea bears witness to its violent history. Each crater seen here by NASA's Cassini spacecraft records an impact in the moon's past.
Thin lineaments cross back and forth, intersecting craters on the surface of Saturn's moon Rhea in this equatorial view captured by NASA's Cassini spacecraft.
Saturn's rings and small moon Prometheus obscure NASA's Cassini spacecraft's view of the planet's second largest moon, Rhea. Prometheus can be seen just below the center of the image, in front of Rhea.
NASA's Cassini orbiter has revealed many surprises within the Saturn system, including the possible presence of a ring of debris surrounding the ancient heavily cratered surface of Rhea, Saturn's second largest moon.
NASA's Cassini orbiter has revealed the possible presence of a ring of debris surrounding the ancient heavily cratered surface of Rhea, Saturn's second largest moon. The bluish material in this image is believed to be fresh ice.
These three enhanced-color views of an equatorial region on Saturn's moon Rhea were made from data obtained by NASA's Cassini spacecraft. The colors have been enhanced to show colorful splotches and bands on the icy moon's surface.
Two of Saturn's icy moons pass each other in a mutual event recorded by NASA's Cassini spacecraft. The smaller moon Enceladus passes in front of the larger moon Rhea.
Southern terrain on Saturn's moon Rhea is dimly illuminated by Saturnshine in this view of the dark side of the moon captured by NASA's Cassini spacecraft.