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Looking for Planet Nine, Astronomers Gaze into the Abyss

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Planet Nine concept

An artist's concept of Planet Nine backlit by the far-distant sun. Thought to be lurking in the depths of the outer solar system, this world is predicted to be several times the mass of Earth, with a thick atmosphere surrounding a rocky core.

Credit:Caltech; R. Hurt (IPAC)

It's been just over two years since Caltech astronomers Mike Brown and Konstantin Batygin made an explosive claim: Based on the orbital motion of objects in the Kuiper Belt—a region beyond Neptune that is home to Pluto and other icy bodies—there must be a very big something much farther out, hidden save for its subtle gravitational tugs on the rest of the solar system.

From Scientific American
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