Researchers Working to Solve Planet 9 Mystery

Scientists are pretty sure Planet Nine is out there, they just can't figure out how it got to the outer reaches of our solar system. That's the perplexing conclusion of some new research by astronomers at the Harvard-Smithsonian Center for Astrophysics (CfA). "The evidence points to Planet Nine existing," says Gongjie Li, a CfA astronomer and lead author on the new research.  "...but we can't explain for certain how it was produced." Long...

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