Do you know what a
Stanford Torus is?
Yes, and I read about something similar in Niven's
Ringworld.
Maybe we could even build a Dyson Sphere -- but I'm not holding my breath.
OK, what would be the effects of removing ourselves from the biomic collective we're a part?
Consider: We're not independent, autonomous organisms. Most of the cells in our bodies are not human. Our bodies are complex, interactive, carefully balanced collections of human and microbial cells -- a
community of organisms.
We have no ecological idea of what these alien cells are doing, how they're interacting, how the balance is maintained, or what long-term effects an imbalance would cause.
We live in a sea of these microbes. They come and go, live and die, and there's constant in and-out traffic, replenishing them and maintaining the balance. Remove us from this biological milieu we tap into to maintain ourselves, and what unanticipated effects would ensue, long-term?
It's not just heat, air, food water, radiation shielding and gravity we need to consider.