What would happen at the core of a water world?

If there existed a planet that was made completely of liquid water, no solid matter at all, what would the core of such a planet be like? Let's assume that this planet has conditions similar to earth, so that it could support liquid water at its surface, with ice caps at the poles. But there's no matter of any kind except for liquid water, pure H₂O. The surface is basically one big ocean. But what would happen if you dove down into that ocean? There would be no solid ocean floor in the traditional sense, but weird things would probably start to happen due to the pressure. Would the water be pressurized into ice? What abnormal properties might this core-ice have? How gradually would this happen? Would the core be hot or cold? If you could survive the extreme pressure, would it be possible to make it all the way to the core?

posted about 8 years ago

possiblySerious‭

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