LV-223 is pretty close to an earth analog, a little colder perhaps, a little less argon and a lot more CO2 (and yes it's a moon). Inside the structures, the air is tailored to humans and presumably engineers. By the inception of the events in the movie, humanity is transforming worlds to better suit them. Given the long period of alien visitations to earth, the engineers spent a substantial amount of time inhabiting 223. Why didn't they do what Weyland Corp does as a buisiness enterprise? Did they sacrifice a breathable atmosphere in exchange for keeping the moon tolerably warm? Was it really such a backwater that it wasn't worth the investment, even with their more efficacious technology, and if so why the aeons long advertising campaign? Did things revert to a prior state after the engineers died/went dormant? The survivor engineer manages to exert himself on the surface without a suit, so perhaps they can tolerate a larger fraction of CO2 for a longer period of time, but the temple suggests they prefer our gas mix. Why is 223 so earth-like yet not quite ...finished?
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