New research shows that some frozen moons may hide boiling oceans beneath their icy shells, shaping strange surface features.
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Jupiter's moon Europa has an ice shell about 18 miles thick — and that could be bad news for alien life
After years of debate, NASA researchers have zeroed in on the thickness of the Europa's ice shell. We first discovered that the Jupiter moon's surface looked icy in 1979, when Voyager 2 flew by.
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