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What We've Learned About Pluto

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Sputnik Planum, Pluto

A color image of Sputnik Planum, the region known as Pluto's "heart," which is rich in nitrogen, carbon monoxide and methane ices.

Credit NASA/Johns Hopkins Applied Physics Laboratory/Southwest Research Institute

In the year since NASA's New Horizons spacecraft flew by Pluto, the dwarf planet has maintained its icy heart.

From The New York Times
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