The Probable Composition of Pluto and Its Large Satellite, Charon

The probable composition of Pluto and its large satellite, Charon, based on their average densities and location in the solar system (which determined their temperature when they formed) , is:

A) almost entirely ice of one type or another.
B) about half rock and half ice.
C) mostly rock, with a relatively thin layer of water ice over it.
D) rock, with possibly a small, iron-rich core.

Correct Answer:

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