Science Dictionary
Charon   (kâr'ən)  Pronunciation Key 
The only known moon of Pluto. Charon is just over half Pluto's size and orbits it so closely that it was not discovered as a distinct body until 1978. Although Pluto is covered with methane ice, Charon appears to be covered with water ice.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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