Like graffiti sprayed by an unknown artist, unexplained arc-shaped, reddish streaks are visible on the surface of Saturn's icy moon Tethys in new, enhanced-color images from NASA's Cassini spacecraft.

This view of Tethys (1,071 kilometers, 665 miles across) shows the contrast between the more heavily cratered region near the top and the more lightly cratered (and presumably younger) plains toward ...

Cassini offers up this nice view of the craters Odysseus (top) and Melanthius (bottom) on Tethys. Melanthius appears to have an elongated mountain range, rather than a single central peak, at its ...

Tethys, one of Saturn’s larger icy moons, vaguely resembles an eyeball staring off into space in this view from NASA’s Cassini spacecraft. The resemblance is due to the enormous crater, Odysseus, and ...

Cassini gazes across the icy rings of Saturn toward the icy moon Tethys, whose night side is illuminated by Saturnshine, or sunlight reflected by the planet. Cassini gazes across the icy rings of ...

Three of Saturn’s moons — Tethys, Enceladus and Mimas — are captured in this group photo from NASA’s Cassini spacecraft. Tethys (660 miles or 1,062 kilometers across) appears above the rings, while ...

This image was taken on September 24, 2005 and received on Earth September 25, 2005. The camera was pointing toward Tethys at approximately 1,625 kilometers away, and the image was taken using the CL1 ...

Like a half-full moon, cratered Tethys hangs before the Cassini spacecraft in this narrow angle camera view taken on July 3, 2004. Voyager images showed a large fracture on Tethys about 750 kilometers ...