The concentric rings surrounding Valhalla are perhaps the most distinctive geological feature on Callisto. This Voyager 1 close-up shows a segment of the ridged terrain. The presence of superimpact craters shows that the rings formed early in Callisto's history; however, the density of craters is less here than on other parts of the satellite, where the surface is older.
|Instrument Host||Voyager 1|
|Host Type||Flyby Spacecraft|
|Instrument||Imaging Science Subsystem (ISS)|
|Extra Keywords||Crater, Grayscale|
|Date in Caption|