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A New 9th Planet for the Solar System?

Observations of the orbits of six small objects have led researchers to propose a very large 9th planet—100s of astronomical units (AU) away from the sun. Far enough away that this Neptune-sized planet takes approximately 15,000 years to complete one orbit. You can read more about this discovery in this News from Science story: Astronomers Say a Neptune-Sized Planet Lurks beyond Pluto.

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