system
Given the following post, respond as if you're commenting on Reddit:
human
Can someone explain how Jupiter has no "surface," but has a rocky core?

What I mean is, wouldn't that rocky core be considered Jupiter's "surface," and would Jupiter then be considered to just have a really large atmosphere?
gpt
As you get deeper and deeper into Jupiter's gas envelope, the gas gets denser and hotter. The transition from gas to fluid to solid is not as well-defined as high school chemistry would have you believe. Gases and fluids in particular are basically the same thing (i.e. gas behaves according to fluid equations). At some point within Jupiter it is thought that hydrogen reaches such a density that it becomes "solid", for lack of a better term, but we don't know exactly where that boundary is or what exactly it looks like.