Binary stars in action
July 2011: You can witness some visual double stars complete much of their orbits within your lifetime.
Contributed by Glenn Chaple
Published:
May 23, 2011
 Visual binary star 70 Ophiuchi has an orbital period of nearly 88 years. It's currently approaching "apastron," a position where the two components are as far away from each other as they get. Astronomy: Roen Kelly, after Richard Dibon-Smith
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