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Barycentre
The centre of mass around which a system of objects rotate. For example, Earth and Luna both revolve around their barycentre, which is 1707 km inside the Earth along the line between them. Pluto and its moon Charon revolve around their barycentre, which is 700 km inside Pluto along the line between them.
 
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Development Notes
Text by M. Alan Kazlev
Initially published on 08 October 2001.

 
 
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