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Planet Nine in the Solar System?
Konstantin Batigin: Planet Nine is an object that we believe lives in the solar system beyond the orbit of Neptune. It orbits the sun with a period of about 10,000 years and is about five Earth masses. He says Pluto's surface area is almost perfectly equal to the surface area of Russia. Why is Pluto not a planet anymore? We used to... The size matters when it comes to planets.