Broadly speaking, the science fiction genre is concerned with the effects of science or technology on society or individuals. These effects may be epic in scope or personal. The science-fictional elements may be imagined or rooted in reality, original or clich. See science fiction genres for a list of some genres.
Science fiction and fantasy
A science fiction story may be firmly rooted in real scientific possibilities as they are understood at the time of writing, as in Arthur C. Clarkes novel A Fall of Moondust, or highly imaginative, set in an extraterrestrial civilization or a parallel universe, as in Isaac Asimovs novel The Gods Themselves.
Some science fiction portrays events that fall outside of science as currently understood, as in Ray Bradburys The Martian Chronicles. But one alternate viewpoint on such tales is to view them not from the current eras understanding of science, but to view the tale in the context of the known science during the time the tale was written. Another example of that would be Heinleins The Man Who Sold the Moon, which postulated a private enterprise exploration of the earths moon decades in advance of the real events in 1969 thus a contemporary reader might instead take the work as a member of the subgenre Alternate history, rather than the Hard science fiction work it was at the time of its publication.
Also, different readers have different ideas about what counts as scientifically realistic an uneducated person will have different expectations about what science can do than a professional physicist. As Clarke himself stated, any sufficiently advanced technology is indistinguishable from magic . Thus, even fiction that depicts innovations ruled out by current scientific theory, such as stories about faster-than-light travel, may still be classified as science fiction, as they are in the popular Honorverse novels and stories by David Weber.
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