... Credit Copyright: NASA , JPL , Exoplanet Travel Bureau Explanation: Want to take a relaxing interstellar vacation ? Consider visiting Kepler-16b , a world in a binary star system. In fact Kepler-16b is the first discovered circumbinary planet. ... The parent stars eclipse one another in their orbits, observed as a dimming of starlight. But Kepler-16b itself was discovered by following the additional very slight dimming produced during its transits. ... NASA Official: Jay Norris. ...