Quote:
Originally Posted by ravens_cry
Besides to keep the machinery operating you would need an army of robots to mine the resources to keep things nifty. And such activity would leave traces, that we don't see.
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Well, such activity wouldn´t necessarily leave traces that could be detected [by people like us] on the order of parsecs [let alone the fact that such activities would presumably be carried out with a high efficiency, with minimum energy requirements]
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