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Kepler-47
Kepler-47 is a binary star system with at least three planets in orbit around the pair of stars located about 5,000 light-years away from Earth. The first two planets announced are designated Kepler-47b, and Kepler-47c. Kepler-47 is the first circumbinary multi-planet system discovered by the Kepler mission. The outermost of the planets is a gas giant orbiting within the habitable zone of the stars. Because most stars are binary,〔 the discovery that multi-planet systems can form in such a system impacts theories of planetary formation.
A group of scientists from NASA and Tel-Aviv University in Israel discovered the system via NASA's Kepler space observatory in 2012. In November 2013, confirmation of a third planet was announced.〔http://nexsci.caltech.edu/conferences/KeplerII/agenda.shtml〕
==Kepler-47b==
Kepler-47b is a gas giant and resides close to its parent stars and therefore is inhospitable to life. It is thought to be larger than Kepler-47c and is roughly three times the radius of Earth.〔 At present it is unknown if this planet has any moons.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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