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Yes but don’t things become feasible (in centuries or otherwise) because we actually work on them? Progress doesn’t appear out of think air. I don’t think anyone expects thriving space cities within our lifetimes, or even our children’s lifetimes.
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Mars colonies (at least right now) are usually brought up as insurance against extreme tail risk/extinction events where physical proximity is a catastrophe vector (large asteroid strikes, unknown superweapons, out of control bioweapon etc), And for that I think they make sense
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Well I mean OP of this whole thread is talking about us having 2 - 3 centuries left at best. On off chance that closing window causes a catastrophic war earlier I’d hope we did have a backup on mats even if it was resource intensive if it meant rescuing trillions of future lives
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