Ninth Planet May Exist

 

21PLANET-master1050-v2

An artist’s impression of a possible ninth planet. It would be quite large — at least as big as Earth — with a thick atmosphere around a rocky core. CreditCalifornia Institute of Techonology

 

 Caltech scientists Konstantin Batygin and Mike Brown make the case for Planet Nine, a giant planet tracing a bizarre, highly elongated orbit in the outer solar system.

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