title: Science fiction
context: Forrest J Ackerman is credited with first using the term "Sci-Fi" (analogous to the then-trendy "hi-fi") in 1954.[9] As science fiction entered popular culture, writers and fans active in the field came to associate the term with low-budget, low-tech "B-movies" and with low-quality pulp science fiction.[10][11][12] By the 1970s, critics within the field such as Knight and Terry Carr were using sci-fi to distinguish hack-work from serious science fiction.[13] Peter Nicholls writes that "SF" (or "sf") is "the preferred abbreviation within the community of sf writers and readers".[14] Robert Heinlein found even "science fiction" insufficient and suggested the term speculative fiction to be used instead, which has continued to be applied to "serious" or "thoughtful" science fiction.
question: When did feminist science fiction become popular?
answers: 1970s