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evand comments on Astronomy, space exploration and the Great Filter - Less Wrong Discussion
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Are you saying Dyson spheres are inefficient as computational substrate, as power collection, or both?
Because to me it looks like what you actually want is a Dyson sphere / swarm of solar collectors, powering a computer further out.
A huge swarm/sphere of solar collectors uses up precious materials (silicon, etc) that are far more valuable to use in ultimate compact reversible computers - which don't need much energy to sustain anyway.
You seem to be bottomlining. Earlier you gave cold reversible-computing civs reasonable probability (and doubt), now you seem to treat it as an almost sure scenario for civ developement.
No I don't see it as a sure scenario, just one that has much higher probability mass than dyson spheres. Compact, cold structures are far more likely than large hot constructions - due to speed of light and thermodynamic considerations.