Planet Nemesis

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 NOT LONG AGO, CALTECH ASTRONOMERS MIKE BROWN AND KONSTANTIN BATYGIN made an explosive claim: based on the orbital motion of objects in the Kuiper Belt—a region beyond Neptune that is home to Pluto and other icy bodies—they theorized that there must be a very big planet—something—much farther out, hidden from our powerful telescopes. They believe it's there based upon its gravitational tugging and pushing upon the rest of our solar system.