The creation of a Sphereworld and a Ringworld was not fully explained in the game. Below are the steps required:1) Create one or more ships with a spaceyard onboard.
2) Send your spaceyard ship(s) to the target star.
3) Have your spaceyard ship(s) create bases with the necessare components at that location. This is easily done once you have Starbase class bases available.
4) Mothball bases as they are created so you don't waste resources on maintainence.
5) Once you have the necessary materials built, create a base with the correct steller generation component for the world type you want to build.
6) Unmothball your material bases.
7) Activate the generation component.At the end of step 7, all shipsbases with the necessary components will be destroyed, but you'll have you're new, very powerful, synthetic world!