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Ask Science Fiction

126,831 subscribers a community for 7 years, 3 months

last post 123 days ago [+]

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 calls it Watsonian, not a Doylist point of view (Further reading on Watsonian vs. Doylist perspective can be found here, here, and in the dictionary definitions of the two terms.)

Take the fictional rules of the universe to their logical conclusion, ad absurdum.


  • Official rules post
  • FAQ
  • New FAQ
  • Submit a FAQ entry
  • [Tag] your posts with the setting you wish to discuss.
  • Answer the questions from a Watsonian perspective only-- no Doylist answers.
  • If you want to roleplay the answer, this is fine. However, if you want to roleplay as ignorant or incorrect characters, you must add a note saying that your post contains incorrect information.
  • Any fiction is allowed not just science fiction. Avoid questions about real-world pseudoscience (i.e. chemtrails, homeopathy, etc.), however.
  • General questions are allowed, but avoid opinion pieces.
  • No real life questions. AskScience and AskHistorians exist for that.
  • Any sort of competition questions belong in whowouldwin.
  • Sources are welcomed and encouraged.
  • Search for your question, it may have been asked and answered before. (This doesn't, of course, mean there isn't room for further discussion.)
  • Wheaton's Law (Don't be a jerk).
  • Upvote good content; downvote incorrect information. Report anything that discusses metadata or involves personal attacks.
  • Elaborate upon your answers. Low-effort posts (e.g. "Speed Force" with no further explanation when asked a question about the Flash) do not constitute satisfactory answers.

Spoiler Policies

  • The title of your post should not contain spoilers for six months from the date of release. If only the body of your post contains spoilers, you may instead make the title "[Canon] Spoilers: Canon" and not use the link flair. Replace "Canon" with the work or body of fiction in question.
  • Comment spoilers should be formatted on a separate line as \>![Thing to be spoiled.]
  • Our Spoiler policy must be observed for six months following the date of release.
  • Spoilers from works older than six months may optionally be concealed using our flair system, however this is CSS-based and will work only in browsers.

This subreddit is for discussion of fiction using information about the universe and not meta information about the work.

For non-serious answers for real world science problems try:

And just for fun, don't forget to check out our friends at


If you're interested in doing an AMA, message the moderators first so that we can schedule a sticky for you. Any AMA that goes up without alerting the mods will be deleted. Stickies will remain for three days. Only one AMA sticky will go up at a time. AMAs will be scheduled with a first-come, first-serve basis.


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