Callisto was revealed by the Voyager cameras to be a heavily cratered and hence geologically inactive world. This mosaic of Voyager 1 images, obtained on March 6 from a distance of about 400,000 kilometers, shows surface detail as small as 10 kilometers across. The prominent old impact feature Valhalla has a central bright spot about 600 kilometers across, probably representing the original impact basin. The concentric bright rings extend outward about 1500 kilometers from the impact center.
|Instrument Host||Voyager 1|
|Host Type||Flyby Spacecraft|
|Instrument||Imaging Science Subsystem (ISS)|
|Extra Keywords||Color, Crater|
|Date in Caption|