| Rhea |
|
The second-largest satellite of Saturn, discovered by Giovanni Cassini in 1672. Voyager 1 images show that Rhea's light-coloured, icy surface is saturated with craters. At the low temperatures prevailing this far from the Sun, the ice is like rigid rock. There is little evidence that the surface has changed since the era when the impact craters were formed. See also: Table 6. |