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Another Earth-Size World May Lurk in the Outer Solar System
A planet-size object may be orbiting the sun in the icy reaches of the solar system beyond Pluto.
Scientists at the University of Arizona’s Lunar and Planetary Laboratory (LPL) have determined that an unseen object with a mass somewhere between that of Earth and Mars could be lurking in the Kuiper Belt, a region beyond Neptune filled with thousands of icy asteroids, comets and dwarf planets.
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