5

Combustion requires a fuel (hydrogen), an ignition source (your enormous explosive), and an oxidizer. There's a very small amount of oxygen in the atmospheres of the gas giants, almost all of it already bound up in water -- i.e. all the oxygen has already combusted with some of the hydrogen. Without the introduction of a lot more oxygen or other oxidizer, ...


4

That's a tricky question, if you want to go into enough detail. Generally, the gas giants consist mostly of gas, and you can derive the density and thus gravity if you know the equation of state of the gas (that's the tricky bit). A random treatise on the exploration of Saturn's internal structure based on gravity data could be this article as found in ArXiv....


3

We can probe this matter a little more in-depth. This introductory reference describes all the giant or Jovian planets, noting that only the two more massive ones, Jupiter and Saturn, are made primarily of hydrogen and helium. Uranus and Neptune, which did not have as much material to work with and did not become powerful enough to draw large proportions ...


1

I know I shouldn't answer such an unrealistic hypothetical question but here goes... What would happen if Jupiter became solid like Earth and condensed to the size of Earth? Well at these densities the transition from gas at the edge to whatever you'd call it at the center of Jupiter is a bit complicated, there aren't distinct gas/liquid and liquid/solid ...


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