Researchers investigating the highly eccentric orbits of multiple dwarf planets in the Kuiper Belt have found only one method of explaining the observed behavior -- a ninth planet, far larger than Earth, in a highly unusual orbit around the sun.
from ExtremeTech http://www.extremetech.com/extreme/221595-new-research-suggests-our-solar-system-may-contain-a-ninth-planet-far-beyond-pluto
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