2007 or10
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A Huge Unnamed Dwarf Planet, Almost The Size Of Pluto, Has Been Hiding In Our Solar System
Image: Artist’s concept of 2007 OR10 / NASA In a universe full of planets, 2007 OR10 is something special. It’s big, just slightly smaller than the size of Pluto. And it’s close, within our very own solar system. So how did it still manage to take astronomers by surprise?