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Hard science fiction is a category of science fiction characterized by an emphasis on scientific or technical detail, or on scientific accuracy, or on both.[1][2] The term was first used in print in 1957 by P. Schuyler Miller in a review of John W. Campbell, Jr.'s Islands of Space in Astounding Science Fiction.[3][4][5] The complementary term soft science fiction (formed by analogy to "hard science fiction"[6]) first appeared in the late 1970s as a way of describing science fiction in which science is not featured, or violates the scientific understanding at the time of writing.
Here's where I risk the wrath of The Ellis.
Space Opera originally meant metal bikini chicks on sweaty Venus,