Isn't Neptune a gas giant and thus has no surface?
this post was submitted on 06 Aug 2023
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The reality is we dont really know. The "surface" in this article is where the pressure is largely 1 atm. And at that pressure its mostly liquid (albeit hot)
That's a good question that hopefully someone more learned will be able to respond to but you know most of the Earth's surface is water so I suppose Neptune has a surface. I don't know what the technical definition is but I'm assuming it's where particulate / molecules in the atmosphere change states due to temperature and pressure. A bit like how we have H2O in the form of gas as water vapor in the atmosphere and at the surface a liquid as water. The closer you are to the center of the planet the higher the pressure and the temperature.