Spelljammer is a campaign setting originally published for the Advanced Dungeons & Dragons (2nd edition) role-playing game, which features a fantastic (as opposed to scientific) outer space environment.

Source: Spelljammer - Wikipedia

If you are interested in the suggested reading list located in the back of the 5e Players handbook, check out this reading challenge.  Dungeons & Dragons Player's Handbook Inspirational Reading | The StoryGraph

If you are interested in other campaign settings novels, check out these reading challenges: