Kepler-413b: Wobbles of a Circumbinary World

It was always a good bet that we’d get plenty of surprises as data from Kepler began to come in, but the odd world known as Kepler-413b really does stand out. The transit method seems made to order for a certain regularity — Kepler looks at how the light from a given star dims when a planet passes in front of it as seen from Earth. Slight changes in these transits can help us detect other worlds in the system or, perhaps, help us make future discoveries of exomoons. But what happens when the transit is so erratic that both these scenarios can be ruled out?

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