Craters on Jupiterís moon Callisto

Craters on Jupiterís moon Callisto

Fig. 2.17 . The ancient surface of Callisto shows one of the highest densities of impact craters in the solar system. The satelliteís icy surface is as rigid as steel, permitting it to record the bright scars of a heavy bombardment by meteorites roughly 4.0 billion years ago. As shown in this image, taken from the Galileo spacecraft in May 2001, Callistoís surface seems uniformly cratered, but it is not uniform in color or brightness. Scientists believe the brighter areas are mainly water ice, while the darker areas are highly eroded, ice-poor material. (Courtesy of NASA/JPL/DLR.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University