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roystgnr comments on Planets in the habitable zone, the Drake Equation, and the Great Filter - Less Wrong
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100,000 light years across; you may be thinking of 10,000 light years thick.
But in any case, small enough for an expansive civilization to colonize, slower than light using nothing more "speculative" than fission-based rockets, in a fraction of a percent of the age of the galaxy.
Yes, thanks. That's what I was thinking of.