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The myth of the starship
Such an interstellar capability isn't going to look much like a "ship". It's going to look more like a DVD balanced on a microwave beam, or a can of beans hanging below a light sail energized by lasers powered by huge orbiting solar power stations. There won't be any biological agencies aboard: just AGIs or something equivalent ported out of a fleshbody's cranium. No hands, only nanotech assemblers. And after a voyage of decades or centuries it's going to have to stop — somehow braking at the other end — then spend more decades farming rocks, slush and sunlight to build ever-bigger physical structures until it can build the equipment with which to phone home.