Renegade 13 said:
Yep it does work in systems with or without nebulae. The only thing that stops star creation in a system is if there's another star in the system.
Or system shield or ring-/sphereworld. Well... these were mentioned before but I'm not sure about system shield. Does it stop star creation? Never tried.
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If you give a man a fish, he will eat a day;
But if you teach a man to fish, he will buy an ugly hat;
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A system shield needs to be built on a planet, which meens you need a star in the system already, so you couldnt build another. I don't think there is any way around that.