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Evidence Grows For Giant Planet on Fringes of Solar System

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Planet 9

This artist's conception shows the view from (hypothetical) Planet Nine back toward the Sun.

Credit: Caltech/R. Hurt (IPAC)

A century after observatory founder Percival Lowell speculated that a 'Planet X' lurks at the fringes of the Solar System, astronomers say that they have the best evidence yet for such a world. They call it Planet Nine.

From Nature
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