Terraforming

I think the possibility for a solid surface deep within Jupiter still exists, though. Not entirely sure about that.

I did some brief studying of Jupiter a few years ago while working on a Sci-fi novel which never actually materialized, and that sounds about right. The outer layer is gaseous and comprised mainly of Hydrogen and Helium, but there is indication of some sort of solid core within based on the gravitational forces present. We just have no way of probing that deeply into the planet.