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Q&A What would be the mass source for a futuristic retreat's reactor?

Consider the following: We have a city, designed to be a retreat. Everything consumed and needed by the population is created via a machine in the middle of this stronghold. This machine is able ...

7 answers  ·  posted 8y ago by System‭  ·  last activity 8y ago by System‭

Question energy science-fiction far-future future