"On Oct. 10, NASA aims to start finding out, when it launches the $5 billion Europa Clipper spacecraft on a five-and-a-half-year journey to the Jovian system for the most detailed exploration ever of the mysterious icy moon."
"The moon's two impact craters also froze in a rough pattern of concentric circles, pointing to ripples in the water below. Astronomers now believe that Europa has an ice shell 10 to 15 miles thick, covering a global ocean 40 to 100 miles deep."
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