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How Pluto Got Its Heartis the first spacecraft to explore Pluto close up. It took nine years to reach the dwarf planet and a few more years to go to the Kuiper Belt, a vast ring of icy bodies at the outer edge of the ...
Pluto is in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is made primarily of ice and rock and has only one sixth the mass of Earth's moon, and one third its volume.
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