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Looking for Planet 9? There’s an app for that

Image: Planet X
An artist’s conception shows Planet X, a.k.a. Planet Nine. (Credit: Robin Dienel / Carnegie Inst.)

Citizen scientists can join an online hunt for icy worlds, brown dwarfs and other yet-to-be-discovered objects beyond the orbit of Neptune, using a technique that’s not all that different from the method that led to Pluto’s discovery 87 years ago.

“Backyard Worlds: Planet 9” could even lead to the discovery of a super-Earth that may (or may not) be hidden on the solar system’s far frontier. The icy world known as Planet Nine or Planet X is only theoretical for now, but its existence would explain some of the puzzles surrounding the weird orbits of some far-out objects.

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By Alan Boyle

Mastermind of Cosmic Log, contributing editor at GeekWire, author of "The Case for Pluto: How a Little Planet Made a Big Difference," president of the Council for the Advancement of Science Writing. Check out "About Alan Boyle" for more fun facts.

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