Feasibility of a gas giant made of oxygen and water vapor?

In a distant galaxy, there is a young, yellow-white star. Orbiting this star is a gas giant comprised almost entirely of oxygen-nitrogen, and water. In its core, there is a relatively large nickel-iron body about 1.5 times the size of mercury. Above that is a freshwater ocean, with a "Seafloor" of ice, as it is at such a pressure to solidify above freezing. Above the ocean's surface is a mile and a half thick layer of high-pressure of air. Above that is a very, very thick cloud layer of water vapor. There is a cycle where a patch of clouds dissipate as they precipitate into the ocean, showing the ocean, and vaporizing it into more clouds. On the cloud tops, there are great "balloon animals", creatures which float using specialized organs and use tentacles to catch small algae particles in the clouds. At this layer, the very top, the atmosphere is at such a pressure and temperature to be habitable by humans. The gas giant is in the inner rim of its star's habitable zone and has an Earth-sized moon about 7 times its diameter from it. It has no rings and is around the size of Neptune.

My question is: is such a planet described above possible in normal conditions?

posted over 4 years ago

Greenie E. - Reinstate Monica‭

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