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Circumbinary Planet

(exoplanet orbiting two stars)

A Circumbinary Planet is an Extra-Solar Planet orbiting both stars of Binary Star. The first such system was identified in 2003 and as of 2014, about 15 identifications have been confirmed.

The orbit of such a planet must be beyond a certain Critical Radius or Radius Of Stability to remain stable, generally at least 2-4 times the Semi-Major Axis of the stars' orbits.


(planets)
http://en.wikipedia.org/wiki/Circumbinary_planet

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