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This illustration provided by NASA depicts the Europa Clipper spacecraft above the surface of the moon Europa, foreground, and Jupiter behind. (NASA/JPL-Caltech via AP)

This illustration provided by NASA depicts the Europa Clipper spacecraft above the surface of the moon Europa, foreground, and Jupiter behind. (NASA/JPL-Caltech via AP)

This illustration provided by NASA depicts the Europa Clipper spacecraft over the moon, Europa, with Jupiter at background left. (NASA/JPL-Caltech via AP)

This illustration provided by NASA depicts the Europa Clipper spacecraft over the moon, Europa, with Jupiter at background left. (NASA/JPL-Caltech via AP)