The talk of a 10th planet stems from small anomalies detected in the orbit of Pluto and Neptune. These anomalies could be the works of an extra planet, but it could (almost) equally well be large asteroids. The fact that the Kuiper belt exists makes it very difficult to answer your question with a straight yes or no, but one thing is sure, if there is a planet out there then it is very cold and very battered!
Answered by: Frank Fahrendorf, M.S., MS Technical Unieversity of Denmark
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