@GrantMeStrength@simonbp Yeah, exactly. And I think for Pluto's system specifically that's helpful for trying to figure how the heck you get a bunch of stuff in successive n:1 mean-motion resonances: are they bits of Pluto from a past collision? Or captured somehow? (Probably Simon can say more here)
@sundogplanets@GrantMeStrength The Pluto-Charon system was formed in a giant collision (like the Earth-Moon system), and the small satellites were formed from the debris disk after that impact. Their rock/ice ratio is an important constraint on modeling that impact, which is then useful for helping to model the giant impact that formed the Moon.
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