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Mysterious Planet Nine Hiding Beyond Neptune Might Not Be a Planet at All

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Artist's concept of Planet Nine

Artist's concept of Planet Nine.

Credit: Caltech/R. Hurt (IPAC)

Out past Neptune, something weird is happening to the orbits of a bunch of space rocks circling the sun. Something, scientists believed, that could only be described by the presence of a giant planet—the so-called Planet Nine.

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