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Callisto

Description
Callisto
The outermost Galilean satellite is almost exactly the same size as Mercury.
Numerous craters pockmark Callisto’s icy surface. (a) The series of faint,
concentric rings that cover much of this image is the result of a huge impact
that created the impact basin Valhalla. Valhalla dominates the Jupiter-facing
hemisphere of this frozen, geologically inactive world
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