Callisto D.6.26

25 Jun

Callisto is the least geologically active of the Galilean satellites. Because its way farther out, it doesn’t get that tidal squeeze and release, squeeze, release effect going on.

It has no orbital resonances since it’s the farthest one out, and so it looks a bit more like the Moon or Mercury. It’s an older body, a bit more heavily cratered. But what is a little bit remarkable about Callisto is the relative difference between the very dark areas and the very light areas, where you see the impact craters have had. So you get almost this quite stark contrast between some sort of a very dark surface and a very white underneath.

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