alt Hacker News> The sunlight here comes from its mirrors, and its "gravity" comes from its spin.
Where do the clouds come from? The AI?
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ben_w • today at 8:34 PM
I can't use the site on my phone, can barely even read any of the text, so I don't know the text you're quoting.
If you are asking if clouds in such a structure are realistic, I'd expect so: clouds do form naturally in even much smaller spaces, e.g. one of the NASA buildings, I forget if it was the Saturn V or Space Shuttle assembly building or both.
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They were in the original 1970's renderings too:
https://nss.org/o-neill-cylinder-space-settlement/
Given Earth-like gravity and Earth-like atmosphere, a sufficiently large structure will also have Earth-like clouds.