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Do Scientists think there's an undiscovered Planet X?

Do Scientists think there's an undiscovered Planet X?

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 Where would this mysterious Planet X be found? What makes finding a planet so hard? Is Planet X even a planet? Thank you for being a subscriber! Please leave a great review right here in the app, and you might hear it on an upcoming episode! Get official Who Smarted? Merch: tee-shirts, mugs, hoodies and more, at Who Smarted?
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