Semi-related to this discussion is the novel _Seveneves_ by Neal Stephenson. Essentially, the premise is that the Moon gets hit by a Very Large Thing, and huma

Semi-related to this discussion is the novel _Seveneves_ by Neal Stephenson. Essentially, the premise is that the Moon gets hit by a Very Large Thing, and humanity has to prepare for Earth being hit by some very large bit of the moon. Part of their planning is building a generation-spaceship, designed to last until Earth's hot atmosphere cools to a habitable level, so there is some discussion of "Why live on a spaceship when you can live on a planet?" However, it's not a deep focus. The book has good reviews [1] and I'd strongly recommend it for those who like hard Sci-Fi. However, I would consider only reading the first two parts. The third part is rather extravagant and, imo, lost the thread of the first two parts. It certainly lost my interest. [1]: https://www.goodreads.com/book/show/22816087-seveneves https://www.goodreads.com/book/show/22816087-seveneves