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Copyright 2016 NPR. To see more, visit NPR.

Copyright 2016 NPR. To see more, visit NPR.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

Astronomers think they've discovered a new planet in our solar system.

Now all they have to do is find it.

Nobody's actually seen the new planet. The reason astronomers think it's out there is the strange behavior of some smallish objects in the Kuiper Belt, a collection of celestial objects orbiting in the outer reaches of the solar system.

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