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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.