orbital-structure-of-outer-solar-system_770

Orbits of the distant Kuiper belt and Planet Nine. Orbits rendered in purple are primarily controlled by Planet Nine’s gravity and exhibit tight orbital clustering. Green orbits, on the other hand, are strongly coupled to Neptune, and exhibit a broader orbital dispersion. Updated orbital calculations suggest that Planet Nine is an approximately 5 Earth mass planet that resides on a mildly eccentric orbit with a period of about ten thousand years. (Credit: James Tuttle Keane/Caltech)

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