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.
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.
This planet is situated within the habitable zone and its radius is 4 times the Earth's. Although it is assumed Kepler-47c is not capable of harbouring life. Kepler-47c is marginally larger than Neptune and could possibly have a dense atmosphere.
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