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Comment on First water plume seen firing from Jupiter moon Europaparent

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does this mean it's pure conjecture that it was a water plume? my idea of a water plume would say that it's sub surface ocean water getting ejected out of the surface. this evidence seems like it could have been water knocked up by a meteor impact or some other mechanism to get the surface ice into orbit.

it's my understanding that the gravitational "torsion" from Jupiter alone is enough to do all sorts of things (like keep a planet thermally active)

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