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The Mystery of Planet Nine | How the Universe Works | Science Channel

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A mysterious ninth planet lurks in the outer reaches of our solar system and it’s a giant: ten times the mass of the Earth. But why is it so hard to catch a glimpse of?

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About How the Universe Works:
With a cast of experts and eye-popping CGI, we're looking under the celestial hood to tell the greatest story of all -- the story of where we and everything else came from.

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