How is the water ice in the mantle of Neptune vastly different from water ice in a comet's nucleus?
Answer
Neptune's mantle water exists under extreme pressure as a dense, hot fluid or plasma, not a simple solid.
While comet water is frozen solid due to cold, the water in Neptune's mantle exists under immense pressure, packed tightly but potentially at temperatures exceeding $2,000^ ext{o} ext{C}$, existing as a dense fluid or plasma state.
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