Crater degredation on Callisto and Ganymede
Filed under pretty pictures, explaining science, Jupiter's moons, Ganymede, Callisto, Galileo, ice worlds
Callisto is unique among the Galilean satellites of Jupiter for the process by which its craters appear to fall apart over time, "until they look like Stonehenge." This is quite different to the way that craters degrade on other icy worlds, where viscous relaxation eventually flattens them out.
NASA / JPL / Jeff Moore
Original image data dated on or about September 17, 1997