[Space] A World design question regarding "Hadean" and "Ice" planets

[t@nya]

Originally Posted by Agemegos

Surely that has been obvious for ages?

Yes, but now the actual percentage (ratio) between gas giant and the total mass of its moons is known. The mass of every gas giant system in our solar system is that same 1:10,000 ratio and the science shows that the same ratio would apply to extrasolar gas giant systems.