List of SF genres and sub-genres
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A series of genres & sub-genres, with sometimes conflicting definitions.
major breakdown
Based on setting
Based on earth era
Historical SF
- Alternative history (usually imagines the world as it would have been had a major event occurred differently)
- Secret history (secret conspiracy or organization or species; supposedly normal life persists. Secret history stories pop up particularly in science fiction. They are, effectively, a subcategory of alternate history; but rather than supposing some major event went another way, they suppose a group of manipulators, hidden conspirators, minor events, unknown events, that conspired to get us here, today, to the place we are.)
- Alternative universe (very similar to earth-normal but tweaked in significant, or insignificant, ways)
- Time travel
Based on plot
- Mystery
- Western
- Romance
Based on plausibility
- Speculative fiction - what if this happens?
- Science fiction - This could theoretically happen
- Fantasy - this could not happen
Based on technology
Based on a particular science/study
Based on sensibility / literary mode
- Horror
- Prose
- Poetry
Further reading
- Lee Masterson's "Science Fiction Sub-Genres"
- The Terraformer
- Nonny Morgan, "Subgenres Demystified"