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All the land in our solar system
(imgs.xkcd.com)
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this post was submitted on 05 Aug 2025
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Isnt Jupiter mostly gas/liquid with only a solid core?
Does it even have a solid core?
probably? according to this diagram, it consists mostly of metallic hydrogen, which i interpret to mean "hydrogen in a solid phase".
Metallic Hydrogen apparently just means "hydrogen in a state that conducts electricity". No idea what kind of pressure and temperate would form actually solid hydrogen, but from my understanding the gas giants are quite hot internally.
And by that diagram the core would be massive.
From what I can see it's a diffuse core, meaning it's a gas until it isn't, but with no real line between the two.
yeah i read up on it and all four giants (jupiter, saturn, uranus, neptune) have no "clear" surface: they all have a gaseous atmosphere on the surface, but when you go down, it goes above the critical point and therefore continuously changes into a liquid phase with no clear line in between. very deep inside, they all have cores made from rocks, but it's rather small compared to the total size of the planet.
Arent the oceans?
The thing about Jupiter is that if it has a solid core (IIRC it's not 100% sure yet, though maybe things have changed since I last checked), there's still no surface. As you go down, it just goes from gas through liquid to solid gradually without any clear boundaries.
If you were to "land" there, you'd just sink down until you reached the depth with the same density as your vehicle and stay there.
oh wow thats really cool thanks!
it's not so cool for the spaceships that attempt to land there as they'd be squashed to death, presumably, but yeah, from a scientific point of view, it's cool :D (not really since it's rather hot inside)