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Q & A

Q. Why isn't Charon (Pluto's sister planet) considered a planet?

A. Some people say Charon is a planet, some think it is a moon. Sometimes, Charon and Pluto are regarded as double planets. Other people don't regard Pluto as a planet at all. They think it is a giant icy asteroid. Charon is slightly smaller than Pluto. People are fascinated by the two because they are closer in size than most planets and their satellites. Charon and Pluto always face each other. Charon is named for a character in mythology that carried the souls of the dead across the river Styx to Hades. Charon is usually regarded as a moon because it closely orbits Pluto. Some people believe that Pluto and Charon may have been ejected from Neptune as a satellite pair.