reply to post by Aquarius1
Europa is not "nothing but water". There is a solid rocky moon under all of the water. Nobody is sure how deep the ocean is, but it is probably at
least several km deep.
The water is kept liquid due to "tidal forces" caused by Jupiter pushing, pulling and squeezing Europa. The friction caused by the pulling and
squeezing may be enough to heat up the rocky part of the moon for the water to remain liquid, but it wouldn't necessarily be so hot that the water
could not exist.
EDIT: MrVertigo beat me to the gravity/tidal forces explanation.
[edit on 10/13/2009 by Soylent Green Is People]
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