Because Pluto is so far away, very little information is known about it. Like Venus, Pluto has retrograde rotation. It spins in the opposite direction to its direction of revolution. A "best guess" for Pluto's structure is that it has a large rocky core, an ice mantle, and a water and methane ice crust. Pluto's moon, Charon, is nearly as large as pluto itself. Some scientists speculate that Pluto and Charon are examples of large debris left from the formation of the solar system.

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