psyhprog

I'm working on a project for a space habitat, and I want to have the math to back it up. By the way this is not homework, it's just something I do in my spare time. And if you have the links where I can learn more about these things, just provide those and I'll learn on my own.

Is there any way (including artificial means) to fission a stable nuclei? I know unstable nuclei such as U238 can be fissioned and some like Cf252, spontaneously fission over time.

P.S. Is there anyway to gather simple elements from stars and other space objects such as hydrogen and helium and artificially turn them into nitrogen, carbon or oxygen, and if so how?

P.P.S. If the questions are too vague, then I apologize.