Questions regarding Charon, the largest satellite of the dwarf planet Pluto. Often considered to be Pluto's binary.

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What theories are there in explaining the formation of the Pluto-Charon system?

After reading the question and answer to Effect of Charon on Pluto, a further question is this: how is the Pluto-Charon relationship explained? Specifically, what theories are there in how did the ...
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Effect of Charon on Pluto

Even though Pluto is not known as a planet anymore, theroetically it has/had a moon, called Charon. I've heard about something that their size are so close to each other that while Charon rotates ...