Craters stand shoulder-to-shoulder on the surface
of Saturn's satellite Rhea, seen in this Voyager 1 mosaic of the
highest-resolution picutes of the north polar region of the moon.
Rhea is 2,400 kilometers (1,490 miles) in diameter and is the
most heavily cratered of the moons of Saturn. The largest crater,
made by the impact of cosmic debris, is about 300 kilometers (185
miles) in diameter. Many craters have central peaks formed by
the rebound of the floor after the explosive formation of the
crater. Multiple ridges and grooves visible near the shadow edge
resemble those seen on Earth's Moon and Mercury. The pictures
were taken by Voyager on Nov. 13, 1980 from a distance of about
80,000 kilometers (50,000 miles). The Voyager Project is managed
for NASA by the Jet Propulsion Laboratory, Pasadena, Calif. (P-23177)
