[Puke]

I think you could have no-atmosphere gas giants pre 1.11 patch, but it might have just been in the demo. I still want to see what happens when you convert atmosphere of a gas giant to none. have not tried it yet.

as a reply to myself on the hive world comment below: tried this using the racial trait for more planet space, and tried it with stellar manipulation world construction. would work, but world construction can only happen around a star (and a custom world type would need to be created), and the racial advantage cant apply to facilities or any kind of component.

as a side note, I noticed that creating a ring or sphere world will effectively get rid of a star, that means that an unstable star is no longer a problem waiting to happen, and the next time you cant justify the cost of a sphereworld, it might be the perfect way to save that system with 5 huge colonized planets in it.