How does the presence of Charon support the idea that Pluto is a planet?
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Answer:
Pluto's moons. ... Both Pluto and Charon orbit a point in space that lies between them, similar to the orbits of binary star systems, For this reason, scientists refer to Pluto and Charon as a double dwarf planet, double planet or binary system.
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Pluto is a fairly large body, massive enough for gravity to pull even rock and ice into its rounded shape. (That's the geophysical definition of planet, by the way, and everybody agrees that Pluto is that large.) Not only that, it's got enough gravity to hold an atmosphere, too.
Charon is almost half the size of Pluto. The little moon is so big that Pluto and Charon are sometimes referred to as a double dwarf planet system. The distance between them is 19,640 km (12,200 miles). ... Compared with most of the planets and moons, the Pluto-Charon system is tipped on its side, like Uranus.
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