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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.


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

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