No magnetosphere = no shield from solar wind = any atmosphere you create well just get stripped away again.
(, Thu 23 Sep 2021, 0:52, Reply)
It's not like you'd notice a difference in air pressure from one day to the next.
Anyone living there would have time for civilisation to collapse and re-establish itself 2 or 3 times before needing to fetch some more comets.
(, Thu 23 Sep 2021, 1:03, Reply)
Terraforming was probably the wrong word to use in that context, although you would need to establish such a ridiculous amount of arable land in order to sustain the population, that calling it terraforming wouldn't be so far off the mark - even if it was in an enclosed system.
(, Thu 23 Sep 2021, 9:27, Reply)