Hyperion is the largest highly irregular (non-spherical) body in the solar system. It seems likely that Hyperion is a fragment of a larger body that was broken by a large impact in the distant past.
Here is a really cool hi-res picture from NASA showing what the moon looks like.
It is a large picture, so it might take a second to load. And it will probably fill up your whole screen. But it’s worth it. Amazing stuff.
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