The 'big' Orion impulse powered ships Dyson was looking into back in the early 60s are difficult to build, but can do the job. And he was looking at delivering 50,000 people and enough equipment to firmly establish a colony. And then realize, the colony doesn't start at 'stone age' or 'bronze age' technology, they start where they left off at when they left our solar system. I'd be surprised if that colony took even 1 thousand years to get to the point of being able to launch their own 'new and improved' colony ship. And in the meantime those of us back here, will have learned from the first one too, and may have made 2 to 4 more colonizing ships.
Travel time from star to star, from the POV of the 'big picture', becomes almost irrelevant once you have colonies sending their own ships out, and those subsequent colonies doing the same.
For the VAST majority of the last couple million years, humans and their predecessors have for the most part just been banging rocks together and poking each other with sticks, maybe we could do something just a little more significant during the next 50,000 years or so ???
Travel time from star to star, from the POV of the 'big picture', becomes almost irrelevant once you have colonies sending their own ships out, and those subsequent colonies doing the same.
For the VAST majority of the last couple million years, humans and their predecessors have for the most part just been banging rocks together and poking each other with sticks, maybe we could do something just a little more significant during the next 50,000 years or so ???
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