And Charon!?!? That's a satellite of Pluto! So does that mean Pluto is a binary dwarf planet?! I'm not sure what the current status is, but I think it quite likely that Pluto-Charon will be considered a binary dwarf-planet system. The reason for this is that their common centre of mass is outside both planets (which is because Charon has roughly half the mass of its 'parent planet', unlike all the other moons).
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I'm not sure what the current status is, but I think it quite likely that Pluto-Charon will be considered a binary dwarf-planet system. The reason for this is that their common centre of mass is outside both planets (which is because Charon has roughly half the mass of its 'parent planet', unlike all the other moons).