r/AskScienceFiction↗
Ask Science Fiction
**It's like Ask Science, but all questions and answers are written with answers gleaned from the universe itself.** Use in-universe knowledge, rules, and common sense to answer the questions. Or as **fanlore.org** calls it [Watsonian, not a Doylist point of view](http://fanlore.org/wiki/Watsonian_vs._Doylist)
894k subscribers773 posts / mo in Sep 2026340 authors / mosince 2011
r/AskScienceFiction has 894k members (+2.7% over the last 12 months). It gets about 773 posts a month from 340 people. Top topics: X-Men Origins, Star Trek Vulcans & Romulans and Halo Lore.
When to post on r/AskScienceFiction
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How r/AskScienceFiction has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/AskScienceFiction
Top topics
Share of the subreddit's posts
- X-Men Origins0.4%
- Star Trek Vulcans & Romulans0.3%
- Halo Lore0.3%
- Superman and Kryptonians0.3%
- Lightsaber Duels & Physics0.3%
Brands people mention
Most-mentioned brands and sites, last 12 months
- Fanlore
- Comic Vine
- xkcd
- Lexicanum
- IMDb
Everything else about r/AskScienceFiction
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research