Phantom 'Planet X' May Lurk at Solar System's Edge

A giant but unseen planet may lurk on the outer edge of our solar system, making its presence known only by disrupting the orbits of nearby celestial objects, according to Rodney Gomes, an astronomer at the National Observatory of Brazil. Astronomers have long observed that a group of small, icy bodies in the so-called "scattered disc" region beyond the orbit of Neptune follow strange orbits around the sun.

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