>entire generations living like nomads in the cold, black emptiness of space The most logical objection to interstellar travel, which I don't see you making, i

>entire generations living like nomads in the cold, black emptiness of space The most logical objection to interstellar travel, which I don't see you making, is that once you have your generation ship, another star is only an unnecessary risk and an infinitesimal chance of a congenial planet. If you can live without a solar system, why do you want to camp next to an unshielded nuclear reactor and poke around the surrounding debris? On the other hand, if something the size of the K-T asteroid or larger was headed for Earth and there was a substantial amount of time to prepare (say 1000 years) then it doesn't matter if people want to abandon it. And I think in that time, it's reasonably possible.