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A Prehistoric Puzzle in the Kuiper Belt

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Ultima Thule

Credit: Credits: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/National Optical Astronomy Observatory

The farthest object ever explored is slowly revealing its secrets, as scientists piece together the puzzles of Ultima Thule—the Kuiper Belt object NASA's New Horizons spacecraft flew past on New Year's Day, four billion miles from Earth.

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