... as 4.7 miles (7.5 kilometers) below the moon's ice crust- (Weinstock). "Planetary scientists say the most likely explanation for the data is a liquid-water ocean similar to oceans found on Earth - a possibility that has extraterrestrial life-seekers reeling with excitement-(Weinstock). The interior of Europa is heated by tidal ... floating on top of a liquid or slush underneath the surface. "It is possible that the plate movements occurred in the past and the water layer is now frozen and can no longer move. However, the surface of Europa is not blanketed with impact craters, an indicati...

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• Grade Level: Undergraduate