North is to the top of the image. The smaller, younger craters are brighter and have sharper, more pronounced rims. This cross-cutting relationship indicates that Thorir is older than the event that produced this fracture. Heavy Cratering near Callisto's South Pole Images from NASA's Galileo spacecraft provide new insights into this region near Callisto's south pole. This two frame mosaic shows a heavily cratered surface with smooth plains in the areas between craters.
North is to the top of the image.
This smoothness of Callisto's surface was not evident in images taken during the 1979 flyby of NASA's Voyager spacecraft because the resolution was insufficient to show the effect. Large Craters in Callisto's Southern Hemisphere NASA's Galileo spacecraft provides a new view of this heavily cratered region in the southern hemisphere of the icy Jovian satellite Callisto. The region was not observed by NASA's Voyager spacecraft. Although all craters are generally round in outline, details in their structures vary with both size and relative age. This crater contains a broad central uplift, or dome, and has a highly eroded rim.