Welcome to 2016. Mike brown and Konstantin Batygin basically proved that the only way we could explain the orbits of Pluto and other KBO was a massive 9th, yet to be discovered rogue planet more than likely ejected from our inner solar system during planet formation.
Welcome to 2016. Mike brown and Konstantin Batygin basically proved that the only way we could explain the orbits of Pluto and other KBO was a massive 9th, yet to be discovered rogue planet more than likely ejected from our inner solar system during planet formation.