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News From the Field

Exiled planet linked to stellar flyby 3 million years ago


February 28, 2019

Paul Kalas of the University of California, Berkeley, was puzzled by the tilted but stable orbit of a planet around a binary star -- an orbit like that of our solar system's proposed Planet Nine. He calculated backwards in time to see if any of the 461 nearby stars ever came close enough to perturb the system. One star fit the bill. The stellar flyby 2-3 million years ago likely stabilized the planet's orbit, keeping it from flying away. Full Story

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University of California, Berkeley

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