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Dwarf planets Sedna and 2012 VP113 travel well beyond the known planets and the Kuiper belt along highly stretched orbits,
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, which implies something once dragged them out there.

Credit: E. Otwell

The enormous,
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, stretched orbits of Sedna and 2012 VP113 are unlike anything else in the solar system. Both are too far from Neptune to feel its effects. And they’re too far from the Oort cloud, the distant shell of ice boulders thought to envelop the solar system. Their trajectories could be a relic of a passing star, or the changing influence of the Milky Way’s gravity as the sun moves around the galaxy — or of a massive planet, long-gone or yet to be detected.
The case for an additional planet got stronger when Trujillo and Sheppard realized that Sedna and 2012 VP113 had something in common with 10 other objects. All the objects beyond 150 astronomical units come closest to the sun,
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, a point known as perihelion, at nearly the same time that they cross the plane of the solar system. There’s no reason for these perihelia to bunch up like that. Billions of years of evolution should have left the perihelia scattered,
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, like the rest of the Kuiper belt — unless something was holding the perihelia in place.
Trujillo and Sheppard estimated that a planet about two to 15 times as massive as Earth,
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, at a distance of? 250 astronomical units (about eight times as far from the sun as Neptune)

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