Do the gas giants have a solid surface?
Short answer: no The gas giants (Jupiter, Saturn, Uranus, and Neptune) all are primarily made up of hydrogen. As you go deeper into the planets, the pressure increases (a lot). At the cores (certainly of Jupiter), there exists some metallic hydrogen core, possibly Earth-sized. Deep in the gas giants, the pressure becomes so immense, that funny things start happening; gases start behaving like liquids, and so on… it’s really an exotic environment. Whatever you do though, do NOT think of the core of a gas giant as a “solid surface” and the rest of the planet as an atmosphere.
