Quartet of exoplanets locked in complex dance

Orbital structure points to planetary migration in solar systems, study finds.

The four planets of the Kepler-223 star system seem to have little in common with the planets of Earth’s own solar system. And yet a new study shows that the Kepler-223 system is trapped in an orbital configuration that Jupiter, Saturn, Uranus and Neptune may have broken out of in the early history of the solar system. 

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