system
Given the following post, respond as if you're commenting on Reddit:
human
Is the sun just gas or does it have a solid surface?
gpt
The Sun has no liquids or solids. The entire Sun is plasma with the exception of some of the atmosphere (the outer few hundred km of the Sun) which is cool enough that not very much of it is ionized.

There isn't any clear "surface" to the Sun, either. We often define the surface to be the photosphere, the place at which the optical depth τ=2/3, because this results in roughly one-half of the light we see coming from layers below the photosphere and one-half coming from layers above the photosphere. But there's no actual physical boundary at the photosphere.