Remember Pluto's big, white, icy heart? A new study, led by Brown University geologist Brandon Johnson, says there's a good chance that beneath that ice, there's 62 miles (100 km) of liquid water. And ...

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Tombaugh Regio — the large, pale heart that dominates Pluto's terrain — is made of nitrogen ice that accumulated after a huge, slow-motion impact, new research suggests. When you purchase through ...