Or Pandorum (2009)? Anything set on a large spaceship meant to transport colonists to another star system, over an extremely long period of time, but something goes wrong.

Now that I'm typing this, I am experiencing deja vu. Have I posted this question before, and just forgot?!? Sorry.

Whatever... anyway, there is an old story by Robert Heinlein that I liked a lot when I first discovered it, when I was in around fifth grade. Wait, I read the segment of this called Universe, apparently there is another segment that I'm not sure I ever read. I should seek that out. The collected, total version, including both segments, is discussed here.
https://en.wikipedia.org/wiki/Orphans_of_the_Sky

I also read Proxima Centauri by Murry Leinster. I had a few books and anthologies of very old science fiction when I was a kid, I didn't even really understand that they were outdated in some ways.... anyway, Proxima Centauri is a short story.
https://en.wikipedia.org/wiki/Proxima_Centauri_(short_story)

Anyway, I just noticed this little list on Wikipedia, so that'll give me a start. Does anybody here have any thoughts to add to this??
https://en.wikipedia.org/wiki/Orphans_of_the_Sky#See_also