This diagram compares our own solar system to Kepler-47, a double-star system containing two planets, one orbiting in the so-called "habitable zone." This is the sweet spot in a planetary system ...

The two planets of Kepler-47, the first transiting circumbinary system -- a system with more than one planet orbiting a pair of stars. Kepler-47b, on the right, has three times the radius of earth ...

This artist's concept illustrates Kepler-47, the first transiting circumbinary system -- multiple planets orbiting two suns – 4,900 light-years from Earth, in the constellation Cygnus. The system was ...