Kepler-47 is a 3.5-billion-year-old star system about 3,340 light years away from Earth. It's one of nine systems that we know of that are "binary star systems," which means it has not one star at its heart, but two. And it's the only one we know that has two planets orbiting around it: Kepler-47b and Kepler-47c.
Well, make that three.
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