Saturn's Icy Realm
Three of Saturn's icy moons are seen here, along with the magnificent water-ice rings and the cold gaseous envelope of the planet's atmosphere. Saturn's dark shadow stretches completely across the rings.
At nine and a half times farther from the Sun than Earth, Saturn inhabits the deep cold of the outer solar system. The Sun appears only 1 percent as bright there as it appears at Earth, creating an environment where ice dominates over rock.
The icy Moons visible here, from left to right are: Janus (181 kilometers, or 113 miles, across), Enceladus (505 kilometers, or 314 miles, across), and Epimetheus (116 kilometers, or 72 miles, across).
The image was taken in visible green light with the Cassini spacecraft wide-angle camera on June 1, 2005, at a distance of approximately 2.4 million kilometers (1.5 million miles) from Saturn. The image scale is 139 kilometers (86 miles) per pixel.