Can a 100,000km-deep ocean exist somewhere in the universe? Is there a critical depth that makes water cease to be liquid?

  • $\begingroup$ Depends on salinity, temperature and strength of gravity. You say somewhere in the Universe... can you be more specific about the conditions? $\endgroup$
    – innisfree
    Apr 19, 2017 at 5:55
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    $\begingroup$ At 100,000 km depth the pressure will be such that the water is no longer water as we know it. At those pressures the water will be so dense that it will be tougher than steel. Do you still call that "liquid water"? $\endgroup$
    – hdhondt
    Apr 19, 2017 at 10:22
  • $\begingroup$ Effectively a dupe of physics.stackexchange.com/q/284533 (which is unanswered) $\endgroup$
    – Kyle Kanos
    Apr 19, 2017 at 12:17

1 Answer 1


As of till now TRES4 is the biggest planet located in the constellation Hercules which is 70% larger than Jupiter in diameter (i.e. around 250000 km in diameter ), but has only 80% of Jupiter's mass and it is thought that the intense heat expand the gasses that make up this planet, resulting in an almost 'marshmallow-like' density that means it contains no oceans. And for being 100000 km deep ocean the planet size has to be at least 300000 km in diameter so it is not possible till now and i dont think it is possible for existence of such a big planet.

The water will not be liquid anymore in that much depth due to the huge pressure it will be take form of ice which will be stronger than steel but the ice will not be cold as the ice we made out of freezer.


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