> To get a gas giant, you first need the formation of a "regular" planet through accretion of material in orbit. Once that regular planet is big enough, by capt

> To get a gas giant, you first need the formation of a "regular" planet through accretion of material in orbit. Once that regular planet is big enough, by capturing enough material, its' strong gravity allows it to start pulling in more and more gas, creating a gas giant. That's just one theory, right? There are competing hypotheses where they form much like stars do, simply by enough gas coalescing to do the same job that the "regular" planet "seed" would.