If we have fake sun and air which is indistinguishable from the real thing, why would you want the real thing? I'm actually quite excited by the same reason --

If we have fake sun and air which is indistinguishable from the real thing, why would you want the real thing? I'm actually quite excited by the same reason -- if we can ween ourselves off of the sun with no side-effects, then that's one less roadblock between us and interstellar travel :D