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Say it's a factory that takes hydrogen and creates fusion. If the machine had a nebula with lots of hydrogen or a gas giant near by, then automated machines could collect it and bring it back to th...
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#1: Attribution notice removed
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System
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2021-03-30T23:53:15Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/33128 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/