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Crater degredation on Callisto and Ganymede

Crater degredation on Callisto and Ganymede

NASA / JPL / Jeff Moore

Crater degredation on Callisto and Ganymede
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.

Most NASA images are in the public domain. Reuse of this image is governed by NASA's image use policy.

Original image data dated on or about September 17, 1997

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