I know that they’re mainly composed of gas but is there any solid land underneath that or is it just gas? And if that’s the case how are they capable of having so much gravity?
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It’s mostly a gradient. Earth atmosphere and earth itself have a very obvious line separating them, mostly because they’re not the same material. With gas giants, the deeper down you go, the thicker the gas gets, to the point you could consider it solid down far enough, but it wouldn’t happen at a discrete line, just gradually. They’re still very dense close to the middle, so gravity is still there.
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