I've been working my way through James Blish's 4part 'space opera' Cities in Flight (1970/1999) & while clearly dated in some aspects (not least its male-centricity) & not wearing its science lightly, at its centre are two interesting elements; the wandering anti-gravity power 'okie' city in space & the going end of all time. Its also been clearly influential on later large scale #scifi but for me too dependent on its characters' lives @bookstodon
