Alien Planet May Have Kicked Its Neighbor Into the Sticks

A planet found at an extreme distance from its parent star may have been kicked out by a fellow planet. A new study of the far-flung alien planet reveals what appears to be a lopsided comet belt surrounding its parent star — a finding scientists say indicates a history of violence in the early planetary system. "Since HD 106906b is very massive, the most likely culprit is another massive planet in the system that gravitationally jostled HD 106906b from its original orbit," Paul Kalas, an adjunct professor of astronomy at the University of California, Berkeley, told Space.com by email.

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