How Do We Know There’s A Planet 9?

If and when this 9th planet comes closer won't it perturb orbits of Kyper belt objects sending many towards Earth and the rest of the inner planets of the solar system?

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Nataero, the Roman god of lost possessions.

"Sodus"

Should be called "Janus" as the planet of Beginnings Endings, Transition, Doorways and Keys, which describes it's position on the edge of the (known) Solar System, Janus being one of the Principle gods, along side the other Roman planets, and as for two faced, it (currently) is hiding from sight, but showing up by effect.