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A New World’s Extraordinary Orbit Points to Planet Nine
2018-05-20T11:00:00Z - Shannon Hall / Wired
In early 2016, two planetary scientists declared that a ghost planet is hiding in the depths of the solar system, well beyond the orbit of Pluto. This makes it an unlikely tool for finding objects inside the solar system, since they mostly orbit within the plane. That small population loops outward toward the same quadrant of the solar system, a phenomenon that would be extremely unlikely to happen by chance. Batygin and Brown argued that a ninth planet must be shepherding those worlds into their strange orbits. “There’s no real way to put something on an orbit like that—except that it’s exactly what we predicted from Planet Nine,” Brown said.

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