Planet Nine: A New Addition to the Solar System?

Elementary science courses have provided a pretty firm grasp of what the solar system looks like.

The map, currently, details eight planets and one former planet. But our planetary neighborhood is much larger and more populated than we might think, with dwarf planets, trojans, and maybe even super-Earths orbiting far beyond Neptune. Now, new evidence may provide the most solar-system-shaking revelation in well over a century.

Two researchers from the California Institute of Technology

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