Science Dictionary
apastron   (ə-pās'trən)  Pronunciation Key 
  1. The point at which two stars orbiting each other in a binary star system are farthest apart.

  2. The point at which an object, such as a planet or comet, is farthest from the star it is orbiting. Compare periastron.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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