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> would be impossible to lift into space

Why on earth would you try that?



Exactly, while an interesting exercise, that would be insane!

But built from Lunar/asteroid material ? Sure, you can build 8 by 32 km cylinder from steel with dirt for shielding with that has a standard earth gravity just fine. No exotic materials required:

https://en.wikipedia.org/wiki/O%27Neill_cylinder




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