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chatquitevoit comments on Rationality Quotes: June 2011 - Less Wrong
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Dyson spheres are unlikely. They use too much physical matter to create. Ringworlds are slightly more likely.
Space elevators are awesome though. We should do that :)
Still waiting on the ability to grow nanotubes long enough, though... we're getting there. We can build them long enough to turn into thread - but proper long-filament nanotubes are the only thing (that we know of so far) that will be strong enough for the elevator ribbon.
The most feasible iteration of a Dyson sphere would probably be the least dense, which would have great influence on the ways they could be used, and that makes them less likely because they are less commercially useful. Still, it could happen.
Ok - I hadn't seen any info on that kind. Yes I agree, it could happen - though I suspect that by the time we get to the stage where we could - we'll probably have invented something even cooler/useful :)