charon

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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