Vacuum Dwellers

[Captain Kwok]

I think I have some bad news for you:

Atmospheric Converters can not be modded to make No atmosphere planets...or was that Gas Giants can't be made to have no atmosphere??? Check that out...

In regards to the question, no it's not possible. However, what you can do is create a new tech area called "Vacuum Technology" with some components and facilities that require that research. Add a new racial trait like "Vacuum Dwellers" (same as Temporal, Crystalline, etc) that has priviledged access to that research area and assigned it to your vacuum race when you set up the game...