Do gas giants actually have a solid core? If so, how big are they usually?
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Yes they do have solid cores, but very small compared to their total size. There is no “surface” though between the gas and the solid core though. As you go deeper and deeper into a gas giant the atmosphere undergoes phase changes. Think a slow transition from thin gas to a very hot, very dense, very viscous liquid, and at certain depths with enough pressure, solid hydrogen just from the pressure.
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