Strange binary star system has three Earth-sized exoplanets

A pair of stars with three planets in orbit around one star or the other is the first system of its kind that has been confirmed.

Pairs of stars, known as binaries, appear to be more common in the galaxy than single stars like our sun. Astronomers have found planets around many of these binaries, but they are mostly orbiting far away from the stars themselves and looping around both stars at the same time.