One Billion Miles Past Pluto, Ultima Thule Beckons
Until 1992, Pluto and its primary moon Charon were believed to be the most distant bodies in the Solar System outside of the Oort Cloud, home to trillions of comets . Then came the discovery of 15760 Albion, followed by 15810 Arawn, 19521 Chaos, 20000 Varuna and some 2,700 other icy bodies that...
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