There were numerous ships that attempted to traverse the Atlantic to form colonies in the Americas. Many were lost, or died out, or failed to thrive for unknown unknowns. And many survived and flourished for reasons not even the settlers understood, and which frankly we will probably never understand because the moment has passed.
In Aurora society took a one-shot approach. This strikes me as unrealistic; why weren't there dozens of competing attempts? I thought the book was one of the best treatments of generation ships that I've ever seen in scifi except for this. And I don't love the "also we discovered new physics and made a sentient AI on our ship somehow" plots (the latter is also a reason I never liked "The Moon is a Harsh Mistress"). I get that it feels unjust or unfair or morally wrong to subject new generations to an experiment that they never signed up for, but that's just the way that humanity works -- all of our children are part of an experiment that they never signed up for, because none of us know (or can even conceivably know) the "right" way or environment in which to raise children.
In Aurora society took a one-shot approach. This strikes me as unrealistic; why weren't there dozens of competing attempts? I thought the book was one of the best treatments of generation ships that I've ever seen in scifi except for this. And I don't love the "also we discovered new physics and made a sentient AI on our ship somehow" plots (the latter is also a reason I never liked "The Moon is a Harsh Mistress"). I get that it feels unjust or unfair or morally wrong to subject new generations to an experiment that they never signed up for, but that's just the way that humanity works -- all of our children are part of an experiment that they never signed up for, because none of us know (or can even conceivably know) the "right" way or environment in which to raise children.