Move over, Planet 9: Does a Mars-sized 10th planet lurk beyond Pluto?

In January last year, astronomers from Caltech suggested that a gigantic so-far-undiscovered planet might be lurking on the fringes of the Solar System. Now researchers from the University of Arizona (UA) have found that if it exists, this so-called Planet Nine might not be alone out there. Weirdly wobbling objects in the Kuiper Belt seem to indicate the influence of yet another planetary body at least as large as Mars.


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