The First Satellite Discovered in Orbit About Pluto Was Charon

The first satellite discovered in orbit about Pluto was Charon. What is unusual about this moon?

A) Charon is the only moon in the solar system known to have an atmosphere.
B) Charon is much warmer than it should be, given its position in the solar system.
C) Compared with planet-satellite systems in the rest of the solar system, Charon is very large and very close to Pluto.
D) Charon is geologically active.

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