Theoretical evidence for an undiscovered super-Earth at the edge of our solar system

It's looking likelier that there is an undiscovered planet orbiting beyond the Kuiper belt. If it's there, it's roughly 10 times the mass of Earth (or about half the mass of Neptune), likely never gets closer to the Sun than about 100 AU, and takes more than 10,000 years to orbit the Sun.

from Planetary Society Blog http://ift.tt/1Uc2q97
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