Science fiction is a genre of fiction dealing with imaginary but more or less plausible (or at least non-supernatural) content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities. Exploring the consequences of scientific innovations is one purpose of science fiction, making it a "literature of ideas".
Science fiction is largely based on writing rationally about alternative possible worlds or futures. It is similar to, but differs from fantasy in that, within the context of the story, its imaginary elements are largely possible within scientifically established or scientifically postulated laws of nature (though some elements in a story might still be pure imaginative speculation).
The settings for science fiction are often contrary to known reality, but most science fiction relies on a considerable degree of suspension of disbelief, which is facilitated in the reader's mind by potential scientific explanations or solutions to various fictional elements. Science fiction elements include:
Science fiction is difficult to define, as it includes a wide range of subgenres and themes. Author and editor Damon Knight summed up the difficulty by stating that "science fiction is what we point to when we say it", a definition echoed by author Mark C. Glassy, who argues that the definition of science fiction is like the definition of pornography: you don't know what it is, but you know it when you see it. Vladimir Nabokov argued that if we were rigorous with our definitions, Shakespeare's play The Tempest would have to be termed science fiction.
According to science fiction writer Robert A. Heinlein, "a handy short definition of almost all science fiction might read: realistic speculation about possible future events, based solidly on adequate knowledge of the real world, past and present, and on a thorough understanding of the nature and significance of the scientific method." Rod Serling's definition is "fantasy is the impossible made probable. Science Fiction is the improbable made possible." Lester del Rey wrote, "Even the devoted aficionado—or fan—has a hard time trying to explain what science fiction is", and that the reason for there not being a "full satisfactory definition" is that "there are no easily delineated limits to science fiction."
As a means of understanding the world through speculation and storytelling, science fiction has antecedents back to mythology, though precursors to science fiction as literature can be seen in Lucian's True History in the 2nd century,     some of the Arabian Nights tales, The Tale of the Bamboo Cutter in the 10th century, Ibn al-Nafis' Theologus Autodidactus in the 13th century, and Jules Verne's A Journey to the Centre of the Earth and Twenty Thousand Leagues Under the Sea in the 19th century.
A product of the budding Age of Reason and the development of modern science itself, Jonathan Swift's Gulliver's Travels was one of the first true science fantasy works, together with Voltaire's Micromégas (1752) and Johannes Kepler's Somnium (1620–1630). Isaac Asimov and Carl Sagan consider the latter work the first science fiction story. It depicts a journey to the Moon and how the Earth's motion is seen from there. Another example is Ludvig Holberg's novel Nicolai Klimii iter subterraneum, 1741. (Translated to Danish by Hans Hagerup in 1742 as Niels Klims underjordiske Rejse.) (Eng. Niels Klim's Underground Travels.) Brian Aldiss has argued that Mary Shelley's Frankenstein (1818) was the first work of science fiction.
Following the 18th century development of the novel as a literary form, in the early 19th century, Mary Shelley's books Frankenstein and The Last Man helped define the form of the science fiction novel; later Edgar Allan Poe wrote a story about a flight to the moon. More examples appeared throughout the 19th century.
Then with the dawn of new technologies such as electricity, the telegraph, and new forms of powered transportation, writers like Jules Verne and H. G. Wells created a body of work that became popular across broad cross-sections of society. Wells' The War of the Worlds describes an invasion of late Victorian England by Martians using tripod fighting machines equipped with advanced weaponry. It is a seminal depiction of an alien invasion of Earth.
In the late 19th century, the term "scientific romance" was used in Britain to describe much of this fiction. This produced additional offshoots, such as the 1884 novella Flatland: A Romance of Many Dimensions by Edwin Abbott Abbott. The term would continue to be used into the early 20th century for writers such as Olaf Stapledon.
In the early 20th century, pulp magazines helped develop a new generation of mainly American SF writers, influenced by Hugo Gernsback, the founder of Amazing Stories magazine. In 1912 Edgar Rice Burroughs published A Princess of Mars, the first of his three-decade-long series of Barsoom novels, situated on Mars and featuring John Carter as the hero. The 1928 publication of Philip Nolan's original Buck Rogers story, Armageddon 2419, in Amazing Stories was a landmark event. This story led to comic strips featuring Buck Rogers (1929), Brick Bradford (1933), and Flash Gordon (1934). The comic strips and derivative movie serials greatly popularized science fiction. In the late 1930s, John W. Campbell became editor of Astounding Science Fiction, and a critical mass of new writers emerged in New York City in a group called the Futurians, including Isaac Asimov, Damon Knight, Donald A. Wollheim, Frederik Pohl, James Blish, Judith Merril, and others. Other important writers during this period included E.E. (Doc) Smith, Robert A. Heinlein, Arthur C. Clarke, Olaf Stapledon, A. E. van Vogt and Stanisław Lem. Campbell's tenure at Astounding is considered to be the beginning of the Golden Age of science fiction, characterized by hard SF stories celebrating scientific achievement and progress. This lasted until postwar technological advances, new magazines like Galaxy under Pohl as editor, and a new generation of writers began writing stories outside the Campbell mode.
In the 1950s, the Beat generation included speculative writers like William S. Burroughs. In the 1960s and early 1970s, writers like Frank Herbert, Samuel R. Delany, Roger Zelazny, and Harlan Ellison explored new trends, ideas, and writing styles, while a group of writers, mainly in Britain, became known as the New Wave for their embrace of a high degree of experimentation, both in form and in content, and a highbrow and self-consciously "literary" or artistic sensibility. In the 1970s, writers like Larry Niven and Poul Anderson began to redefine hard SF. Ursula K. Le Guin and others pioneered soft science fiction.
In the 1980s, cyberpunk authors like William Gibson turned away from the optimism and support for progress of traditional science fiction. The Star Wars franchise helped spark a new interest in space opera, focusing more on story and character than on scientific accuracy. C. J. Cherryh's detailed explorations of alien life and complex scientific challenges influenced a generation of writers. Emerging themes in the 1990s included environmental issues, the implications of the global Internet and the expanding information universe, questions about biotechnology and nanotechnology, as well as a post-Cold War interest in post-scarcity societies; Neal Stephenson's The Diamond Age comprehensively explores these themes. Lois McMaster Bujold's Vorkosigan novels brought the character-driven story back into prominence. The television series (1987) began a torrent of new SF shows, including three further Star Trek spin-off shows and Babylon 5.  Concern about the rapid pace of technological change crystallized around the concept of the technological singularity, popularized by Vernor Vinge's novel Marooned in Realtime and then taken up by other authors.
Forrest J Ackerman used the term sci-fi (analogous to the then-trendy "hi-fi") at UCLA in 1954. 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.   By the 1970s, critics within the field such as Terry Carr and Damon Knight were using sci-fi to distinguish hack-work from serious science fiction, and around 1978, Susan Wood and others introduced the pronunciation "skiffy". Peter Nicholls writes that "SF" (or "sf") is "the preferred abbreviation within the community of sf writers and readers". David Langford's monthly fanzine Ansible includes a regular section "As Others See Us" which offers numerous examples of "sci-fi" being used in a pejorative sense by people outside the genre. The abbreviation SF (or sf) is commonly used instead of "sci-fi".
While SF has provided criticism of developing and future technologies, it also produces innovation and new technology. The discussion of this topic has occurred more in literary and sociological than in scientific forums. Cinema and media theorist Vivian Sobchack examines the dialogue between science fiction film and the technological imagination. Technology impacts artists and how they portray their fictionalized subjects, but the fictional world gives back to science by broadening imagination. While more prevalent in the beginning years of science fiction with writers like Arthur C. Clarke, new authors still find ways to make the currently impossible technologies seem closer to being realized.
A categorization of science fiction into various subgenres can be problematic, because these subcategories are not simple pigeonholes. Some works may overlap two or more commonly defined genres, whereas others are beyond the generic boundaries, either outside or between categories. Moreover, the categories and genres used by mass markets and literary criticism differ considerably. One example that straddles science fiction subgenres is Elizabeth Moon's Vatta's War series, which has been described by many as military science fiction but also has elements of space opera.
See main article: Hard science fiction. Hard science fiction, or "hard SF", is characterized by rigorous attention to accurate detail in quantitative sciences, especially physics, astrophysics, and chemistry, or on accurately depicting worlds that more advanced technology may make possible. Many accurate predictions of the future come from the hard science fiction subgenre, but numerous inaccurate predictions have emerged as well. Some hard SF authors have distinguished themselves as working scientists, including Gregory Benford, Geoffrey A. Landis and David Brin,  while mathematician authors include Rudy Rucker and Vernor Vinge. Other noteworthy hard SF authors include Isaac Asimov, Arthur C. Clarke, Hal Clement, Greg Bear, Larry Niven, Robert J. Sawyer, Stephen Baxter, Alastair Reynolds, Charles Sheffield, Ben Bova, Kim Stanley Robinson and Greg Egan.
See main article: Soft science fiction. The description "soft" science fiction may describe works based on social sciences such as psychology, economics, political science, sociology, and anthropology. Noteworthy writers in this category include Ursula K. Le Guin and Philip K. Dick.  The term can describe stories focused primarily on character and emotion; SFWA Grand Master Ray Bradbury is an acknowledged master of this art. The Soviet Union produced a quantity of social science fiction, including works by the Strugatsky brothers, Kir Bulychov, Yevgeny Zamyatin and Ivan Yefremov.  Some writers blur the boundary between hard and soft science fiction.
Related to Social SF and Soft SF are the speculative fiction branches of utopian or dystopian stories; George Orwell's Nineteen Eighty-Four, Aldous Huxley's Brave New World and Margaret Atwood's The Handmaid's Tale, are examples. Satirical novels with fantastic settings such as Gulliver's Travels by Jonathan Swift may be considered speculative fiction.
See main article: Cyberpunk. The cyberpunk genre emerged in the early 1980s; combining cybernetics and punk, the term was coined by author Bruce Bethke for his 1980 short story "Cyberpunk". The time frame is usually near-future and the settings are often dystopian in nature and characterized by misery. Common themes in cyberpunk include advances in information technology and especially the Internet, visually abstracted as cyberspace, artificial intelligence and prosthetics and post-democratic societal control where corporations have more influence than governments. Nihilism, post-modernism, and film noir techniques are common elements, and the protagonists may be disaffected or reluctant anti-heroes. Noteworthy authors in this genre are William Gibson, Bruce Sterling, Neal Stephenson, and Pat Cadigan. James O'Ehley has called the 1982 film Blade Runner a definitive example of the cyberpunk visual style.
Time travel stories have antecedents in the 18th and 19th centuries. The first major time travel novel was Mark Twain's A Connecticut Yankee in King Arthur's Court. The most famous is H. G. Wells's 1895 novel The Time Machine, which uses a vehicle that allows an operator to travel purposefully and selectively, while Twain's time traveler is struck in the head. The term "time machine", coined by Wells, is now universally used to refer to such a vehicle. Stories of this type are complicated by logical problems such as the grandfather paradox. Time travel continues to be a popular subject in modern science fiction, in print, movies, and television such as the BBC television series Doctor Who.
See main article: Alternate history. Alternate (or alternative) history stories are based on the premise that historical events might have turned out differently. These stories may use time travel to change the past, or may simply set a story in a universe with a different history from our own. Classics in the genre include Bring the Jubilee by Ward Moore, in which the South wins the American Civil War, and The Man in the High Castle by Philip K. Dick, in which Germany and Japan win World War II. The Sidewise Award acknowledges the best works in this subgenre; the name is taken from Murray Leinster's 1934 story "Sidewise in Time." Harry Turtledove is one of the most prominent authors in the subgenre and is sometimes called the "master of alternate history". 
See main article: Military science fiction.
Military science fiction is set in the context of conflict between national, interplanetary, or interstellar armed forces; the primary viewpoint characters are usually soldiers. Stories include detail about military technology, procedure, ritual, and history; military stories may use parallels with historical conflicts. Heinlein's Starship Troopers is an early example, along with the Dorsai novels of Gordon Dickson. Joe Haldeman's The Forever War is a critique of the genre, a Vietnam-era response to the World War II–style stories of earlier authors. Prominent military SF authors include John Ringo, David Drake, David Weber, and S. M. Stirling. The publishing company Baen Books is known for cultivating military science fiction authors.
Superhuman stories deal with the emergence of humans who have abilities beyond the norm. This can stem either from natural causes such as in Olaf Stapledon's novel Odd John, and Theodore Sturgeon's More Than Human, or be the result of intentional augmentation such as in A. E. van Vogt's novel Slan. These stories usually focus on the alienation that these beings feel as well as society's reaction to them. These stories have played a role in the real life discussion of human enhancement. Frederik Pohl's Man Plus also belongs to this category.
See main article: Apocalyptic fiction. Apocalyptic fiction is concerned with the end of civilization through war (On the Beach), pandemic (The Last Man), astronomic impact (When Worlds Collide), ecological disaster (The Wind from Nowhere), or some other general disaster or with a world or civilization after such a disaster. Typical of the genre are George R. Stewart's novel Earth Abides and Pat Frank's novel Alas, Babylon. Apocalyptic fiction generally concerns the disaster itself and the direct aftermath, while post-apocalyptic can deal with anything from the near aftermath (as in Cormac McCarthy's The Road) to 375 years in the future (as in By The Waters of Babylon) to hundreds or thousands of years in the future, as in Russell Hoban's novel Riddley Walker and Walter M. Miller, Jr.'s A Canticle for Leibowitz.
See main article: Space opera. Space opera is adventure science fiction set in outer space or on distant planets, where the emphasis is on action rather than either science or characterization. The conflict is heroic, and typically on a large scale.
Space opera is sometimes used pejoratively, to describe improbable plots, absurd science, and cardboard characters. But it is also used nostalgically, and modern space opera may be an attempt to recapture the sense of wonder of the golden age of science fiction. The pioneer of this subgenre is generally recognized to be Edward E. (Doc) Smith, with his Skylark and Lensman series. The Star Trek television series franchise is often described as space opera that encourages this sense of wonder, in that most of the scripts are generally about peaceful space exploration and examinations of cultural differences rather than about conflict between civilizations. Alastair Reynolds's Revelation Space series, Peter F. Hamilton's Void, Night's Dawn and Pandora's Star series, and Vernor Vinge's A Fire Upon the Deep and A Deepness in the Sky are newer examples of this genre.
See main article: Space western. Space Western could be considered a sub-genre of space opera that transposes themes of the American Western books and film to a backdrop of futuristic space frontiers. These stories typically involve "frontier" colony worlds (colonies that have only recently been terraformed and/or settled) serving as stand-ins for the backdrop of lawlessness and economic expansion that were predominant in the American west. Examples include the Sean Connery film Outland, the Firefly television series, and the film sequel Serenity by Joss Whedon, as well as the manga and anime series Trigun, Outlaw Star, and Cowboy Bebop.
The broader category of speculative fiction includes science fiction, fantasy, alternate histories (which may have no particular scientific or futuristic component), and even literary stories that contain fantastic elements, such as the work of Jorge Luis Borges or John Barth. For some editors, magic realism is considered to be within the broad definition of speculative fiction.
See main article: Fantasy. Fantasy is closely associated with science fiction, and many writers have worked in both genres, while writers such as Anne McCaffrey, Ursula K. LeGuin, and Marion Zimmer Bradley have written works that appear to blur the boundary between the two related genres. The authors' professional organization is called the Science Fiction and Fantasy Writers of America (SFWA). SF conventions routinely have programming on fantasy topics,   and fantasy authors such as J. K. Rowling have won the highest honor within the science fiction field, the Hugo Award.
In general, science fiction differs from fantasy in that the former concerns things that might someday be possible or that at least embody the pretense of realism. Supernaturalism, usually absent in science fiction, is the distinctive characteristic of fantasy literature. A dictionary definition referring to fantasy literature is "fiction characterized by highly fanciful or supernatural elements."  Examples of fantasy supernaturalism include magic (spells, harm to opponents), magical places (Narnia, Oz, Middle Earth, Hogwarts), supernatural creatures (witches, vampires, orcs, trolls), supernatural transportation (flying broomsticks, ruby slippers, windows between worlds), and shapeshifting (beast into man, man into wolf or bear, lion into sheep). Such things are basic themes in fantasy. Literary critic Fredric Jameson has characterized the difference between the two genres by describing science fiction as turning "on a formal framework determined by concepts of the mode of production rather than those of religion" - that is, science fiction texts are bound by an inner logic based more on historical materialism than on magic or the forces of good and evil. Some narratives are described as being essentially science fiction but "with fantasy elements". The term "science fantasy" is sometimes used to describe such material.
See main article: Horror fiction. Horror fiction is the literature of the unnatural and supernatural, with the aim of unsettling or frightening the reader, sometimes with graphic violence. Historically it has also been known as weird fiction. Although horror is not per se a branch of science fiction, many works of horror literature incorporates science fictional elements. One of the defining classical works of horror, Mary Shelley's novel Frankenstein, is the first fully realized work of science fiction, where the manufacture of the monster is given a rigorous science-fictional grounding. The works of Edgar Allan Poe also helped define both the science fiction and the horror genres. Today horror is one of the most popular categories of films. Horror is often mistakenly categorized as science fiction at the point of distribution by libraries, video rental outlets, etc. For example, Syfy (distributed via cable and satellite television in the United States) currently devotes most its air time to horror films with very few science fiction titles.
See main article: Mystery fiction. Works in which science and technology are a dominant theme, but based on current reality, may be considered mainstream fiction. Much of the thriller genre would be included, such as the novels of Tom Clancy or Michael Crichton, or the James Bond films. Modernist works from writers like Kurt Vonnegut, Philip K. Dick, and Stanisław Lem have focused on speculative or existential perspectives on contemporary reality and are on the borderline between SF and the mainstream. According to Robert J. Sawyer, "Science fiction and mystery have a great deal in common. Both prize the intellectual process of puzzle solving, and both require stories to be plausible and hinge on the way things really do work." Isaac Asimov, Walter Mosley, and other writers incorporate mystery elements in their science fiction, and vice versa.
See main article: Superhero fiction. Superhero fiction is a genre characterized by beings with much higher than usual capability and prowess, generally with a desire or need to help the citizens of their chosen country or world by using his or her powers to defeat natural or superpowered threats. Many superhero fiction characters involve themselves (either intentionally or accidentally) with science fiction and fact, including advanced technologies, alien worlds, time travel, and interdimensional travel; but the standards of scientific plausibility are lower than with actual science fiction. Authors of this genre include Stan Lee (co-creator of Spider-Man, the Fantastic Four, the X-Men, and the Hulk); Marv Wolfman, the creator of Blade for Marvel Comics, and The New Teen Titans for DC Comics; Dean Wesley Smith (Smallville, Spider-Man, and X-Men novels) and Superman writers Roger Stern and Elliot S! Maggin.
Science fiction fandom is the "community of the literature of ideas... the culture in which new ideas emerge and grow before being released into society at large". Members of this community, "fans", are in contact with each other at conventions or clubs, through print or online fanzines, or on the Internet using web sites, mailing lists, and other resources.
SF fandom emerged from the letters column in Amazing Stories magazine. Soon fans began writing letters to each other, and then grouping their comments together in informal publications that became known as fanzines. Once they were in regular contact, fans wanted to meet each other, and they organized local clubs. In the 1930s, the first science fiction conventions gathered fans from a wider area. Conventions, clubs, and fanzines were the dominant form of fan activity, or "fanac", for decades, until the Internet facilitated communication among a much larger population of interested people.
Among the most respected awards for science fiction are the Hugo Award, presented by the World Science Fiction Society at Worldcon; the Nebula Award, presented by SFWA and voted on by the community of authors; and the John W. Campbell Memorial Award for Best Science Fiction Novel and Theodore Sturgeon Memorial Award for short fiction. One notable award for science fiction films is the Saturn Award. It is presented annually by The Academy of Science Fiction, Fantasy, and Horror Films.
There are national awards, like Canada's Aurora Award, regional awards, like the Endeavour Award presented at Orycon for works from the Pacific Northwest, special interest or subgenre awards like the Chesley Award for art or the World Fantasy Award for fantasy. Magazines may organize reader polls, notably the Locus Award.
Conventions (in fandom, shortened as "cons"), are held in cities around the world, catering to a local, regional, national, or international membership. General-interest conventions cover all aspects of science fiction, while others focus on a particular interest like media fandom, filking, etc. Most are organized by volunteers in non-profit groups, though most media-oriented events are organized by commercial promoters. The convention's activities are called the "program", which may include panel discussions, readings, autograph sessions, costume masquerades, and other events. Activities that occur throughout the convention are not part of the program; these commonly include a dealer's room, art show, and hospitality lounge (or "con suites").
Conventions may host award ceremonies; Worldcons present the Hugo Awards each year. SF societies, referred to as "clubs" except in formal contexts, form a year-round base of activities for science fiction fans. They may be associated with an ongoing science fiction convention, or have regular club meetings, or both. Most groups meet in libraries, schools and universities, community centers, pubs or restaurants, or the homes of individual members. Long-established groups like the New England Science Fiction Association and the Los Angeles Science Fantasy Society have clubhouses for meetings and storage of convention supplies and research materials. The Science Fiction and Fantasy Writers of America (SFWA) was founded by Damon Knight in 1965 as a non-profit organization to serve the community of professional science fiction authors, 24 years after his essay "Unite or Fie!" had led to the organization of the National Fantasy Fan Federation. Fandom has helped incubate related groups, including media fandom, the Society for Creative Anachronism, gaming, filking, and furry fandom.
The first science fiction fanzine, The Comet, was published in 1930. Fanzine printing methods have changed over the decades, from the hectograph, the mimeograph, and the ditto machine, to modern photocopying. Distribution volumes rarely justify the cost of commercial printing. Modern fanzines are printed on computer printers or at local copy shops, or they may only be sent as email. The best known fanzine (or "'zine") today is Ansible, edited by David Langford, winner of numerous Hugo awards. Other fanzines to win awards in recent years include File 770, Mimosa, and Plokta. Artists working for fanzines have risen to prominence in the field, including Brad W. Foster, Teddy Harvia, and Joe Mayhew; the Hugos include a category for Best Fan Artists. The earliest organized fandom online was the SF Lovers community, originally a mailing list in the late 1970s with a text archive file that was updated regularly. In the 1980s, Usenet groups greatly expanded the circle of fans online. In the 1990s, the development of the World-Wide Web exploded the community of online fandom by orders of magnitude, with thousands and then literally millions of web sites devoted to science fiction and related genres for all media. Most such sites are small, ephemeral, and/or very narrowly focused, though sites like SF Site offer a broad range of references and reviews about science fiction.
Fan fiction, known to aficionados as "fanfic", is non-commercial fiction created by fans in the setting of an established book, film, video game, or television series. This modern meaning of the term should not be confused with the traditional (pre-1970s) meaning of "fan fiction" within the community of fandom, where the term meant original or parody fiction written by fans and published in fanzines, often with members of fandom as characters therein ("faan fiction"). Examples of this would include the Goon Defective Agency stories, written starting in 1956 by Irish fan John Berry and published in his and Arthur Thomson's fanzine Retribution. In the last few years, sites have appeared such as Orion's Arm and Galaxiki, which encourage collaborative development of science fiction universes. In some cases, the copyright owners of the books, films, or television series have instructed their lawyers to issue "cease and desist" letters to fans.
The study of science fiction, or science fiction studies, is the critical assessment, interpretation, and discussion of science fiction literature, film, new media, fandom, and fan fiction. Science fiction scholars take science fiction as an object of study in order to better understand it and its relationship to science, technology, politics, and culture-at-large. Science fiction studies has a long history dating back to the turn of the 20th century, but it was not until later that science fiction studies solidified as a discipline with the publication of the academic journals Extrapolation (1959), Foundation - The International Review of Science Fiction (1972), and Science Fiction Studies (1973), and the establishment of the oldest organizations devoted to the study of science fiction, the Science Fiction Research Association and the Science Fiction Foundation, in 1970. The field has grown considerably since the 1970s with the establishment of more journals, organizations, and conferences with ties to the science fiction scholarship community, and science fiction degree-granting programs such as those offered by the University of Liverpool and Kansas University.
The National Science Foundation has conducted surveys of "Public Attitudes and Public Understanding" of "Science Fiction and Pseudoscience". They write that "Interest in science fiction may affect the way people think about or relate to science....one study found a strong relationship between preference for science fiction novels and support for the space program...The same study also found that students who read science fiction are much more likely than other students to believe that contacting extraterrestrial civilizations is both possible and desirable (Bainbridge 1982).
Mary Shelley wrote a number of science fiction novels including Frankenstein, and is treated as a major Romantic writer. Many science fiction works have received widespread critical acclaim including Childhood's End and Do Androids Dream of Electric Sheep? (the inspiration for the movie Blade Runner). A number of respected writers of mainstream literature have written science fiction, including Aldous Huxley's Brave New World, George Orwells Nineteen Eighty-Four, Anthony Burgess' A Clockwork Orange and Margaret Atwood's The Handmaid's Tale. Nobel Laureate Doris Lessing wrote a series of SF novels, Canopus in Argos, and nearly all of Kurt Vonnegut's works contain science fiction premises or themes.
The scholar Tom Shippey asks a perennial question of science fiction: "What is its relationship to fantasy fiction, is its readership still dominated by male adolescents, is it a taste which will appeal to the mature but non-eccentric literary mind?" In her much reprinted essay "Science Fiction and Mrs Brown," the science fiction writer Ursula K. Le Guin has approached an answer by first citing the essay written by the English author Virginia Woolf entitled "Mr Bennett and Mrs Brown" in which she states:
Le Guin argues that these criteria may be successfully applied to works of science fiction and so answers in the affirmative her rhetorical question posed at the beginning of her essay: "Can a science fiction writer write a novel?"
Tom Shippey in his essay does not dispute this answer but identifies and discusses the essential differences that exists between a science fiction novel and one written outside the field. To this end, he compares George Orwell's Coming Up for Air with Frederik Pohl and C. M. Kornbluth's The Space Merchants and concludes that the basic building block and distinguishing feature of a science fiction novel is the presence of the novum, a term Darko Suvin adapts from Ernst Bloch and defines as "a discrete piece of information recognizable as not-true, but also as not-unlike-true, not-flatly- (and in the current state of knowledge) impossible".
In science fiction the style of writing is often relatively clear and straightforward compared to classical literature. Orson Scott Card, an author of both science fiction and non-SF fiction, has postulated that in science fiction the message and intellectual significance of the work is contained within the story itself and, therefore, there need not be stylistic gimmicks or literary games; but that many writers and critics confuse clarity of language with lack of artistic merit. In Card's words:
Science fiction author and physicist Gregory Benford has declared that: "SF is perhaps the defining genre of the twentieth century, although its conquering armies are still camped outside the Rome of the literary citadels." This sense of exclusion was articulated by Jonathan Lethem in an essay published in the Village Voice entitled "Close Encounters: The Squandered Promise of Science Fiction." Lethem suggests that the point in 1973 when Thomas Pynchon's Gravity's Rainbow was nominated for the Nebula Award, and was passed over in favor of Arthur C. Clarke's Rendezvous with Rama, stands as "a hidden tombstone marking the death of the hope that SF was about to merge with the mainstream." Among the responses to Lethem was one from the editor of the Magazine of Fantasy and Science Fiction who asked: "When is it [the SF genre] ever going to realize it can't win the game of trying to impress the mainstream?" On this point the journalist and author David Barnett has remarked:
Barnett, in an earlier essay had pointed to a new development in this "endless war":
Although perhaps most developed as a genre and community in the United States, Canada, and the United Kingdom, Science Fiction is a worldwide phenomenon. Organisations devoted to promotion and even translation in particular countries are commonplace, as are country- or language-specific genre awards.
Mohammed Dib, an Algerian writer, wrote a science fiction allegory about hisnation's politics, Qui se souvient de la mer ("Who Remembers the Sea?") in 1962.  Masimba Musodza, a Zimbabwean author, published MunaHacha Maive Nei? the first science-fiction novel in the Shona language, which also holds the distinction of being the first novel in the Shona language to appear as an ebook first before it came out in print. In South Africa, a movie titled District 9 came out in 2009, an apartheid allegory featuring extraterrestrial life forms, produced by Peter Jackson.
See main article: Bengali science fiction, Science fiction in China and Japanese science fiction. Indian science fiction, defined loosely as science fiction by writers of Indian descent, began with the English-language publication of Kylas Chundar Dutt's A Journal of Forty-Eight Hours in the Year 1945 in the Calcutta Literary Gazette (June 6, 1835). Since this story was intended as a political polemic, credit for the first science fiction story is often given to later Bengali authors such as Jagadananda Roy, Hemlal Dutta and the polymath Jagadish Chandra Bose (see Bengali science fiction). Similar traditions exist in Hindi, Marathi, Tamil and English. In English, the modern era of Indian speculative fiction began with the works of authors such as Samit Basu, Payal Dhar, Vandana Singh and Anil Menon. Works such as Amitav Ghosh's The Calcutta Chromosome and Salman Rushdie's Grimus and Boman Desai's The Memory of Elephants are generally classified as magic realist works but make essential use of SF tropes and techniques.
Modern science fiction in China mainly depends on the magazine Science Fiction World. Many famous works were published in installments in it originally, including the most successful fiction Three Body, written by Liu Cixin.
Chalomot Be'aspamia is an Israeli magazine of short science fiction and fantasy stories. The Prophecies Of Karma, published in 2011, is advertised as the first work of science fiction by an Arabic author, the Libanese writer Nael Gharzeddine.
See main article: Science fiction in Croatia, Czech science fiction and fantasy, French science fiction, Norwegian science fiction, Science fiction in Poland, Romanian science fiction, Science fiction in Russia, Science fiction in Serbia and Spanish science fiction.
Current well-known SF authors from Germany are five-time Kurd-Laßwitz-Award winner Andreas Eschbach, whose books The Carpet Makers and Eine Billion Dollar are big successes, and Frank Schätzing, who in his book The Swarm mixes elements of the science thriller with SF elements to an apocalyptic scenario. The most prominent German-speaking author, according to Die Zeit, is Austrian Herbert W. Franke.
A well known science fiction book series in German is Perry Rhodan, which started in 1961. Having sold over one billion copies (in pulp format), it claims to be the most successful science fiction book series ever written worldwide.
A particular trend in French literature of the 20th century has consisted of notorious French authors releasing science fiction works alongside their more classical production, and through the same channels, refusing to endorse the science-fiction label, probably out of a mix of snobbishness and chauvinism (science-fiction being considered by most academics as an inferior genre from America). Among these lie famous novels and short stories by René Barjavel and Robert Merle, for example. The genre has long been called "anticipation".
There is, nevertheless, a dedicated science-fiction scene in French literature: see main article.
In Belgian and French movies, science-fiction is represented, but not nearly as much as drama, comedy, or historical film. In Belgian and French comic books, on the other hand, science-fiction is, among other things, a well established (and often pessimistic) genre.
In the case of Canada's Québec, Élisabeth Vonarburg and other authors developed a related tradition of French-Canadian SF. The Prix Boreal was established in 1979 to honour Canadian science fiction works in French. The Aurora Awards (briefly preceded by the Casper Award) were founded in 1980 to recognize and promote the best works of Canadian science fiction in both French and English. Also, due to Canada's bilingualism and the US publishing almost exclusively in English, translation of Science Fiction prose into French thrives and runs nearly parallel upon a book's publishing in the original English. A sizeable market also exists within Québec for European-written Francophone science fiction literature.
See main article: Science fiction in Australia.
Australia: David G. Hartwell noted that while there is perhaps "nothing essentially Australian about Australian science-fiction", many Australian science-fiction (and fantasy and horror) writers are in fact international English language writers, and their work is commonly published worldwide. This is further explainable by the fact that the Australian inner market is small (with Australian population being around 21 million), and sales abroad are crucial to most Australian writers. 
See main article: Canadian science fiction.
Although there is still some controversy as to when science fiction began in Latin America, the earliest works date from the late 19th century. All published in 1875, O Doutor Benignus by the Brazilian Augusto Emílio Zaluar, El Maravilloso Viaje del Sr. Nic-Nac by the Argentinian Eduardo Holmberg, and Historia de un Muerto by the Cuban Francisco Calcagno are three of the earliest novels which appeared in the continent.
Up to the 1960s, science fiction was the work of isolated writers who did not identify themselves with the genre, but rather used its elements to criticize society, promote their own agendas or tap into the public's interest in pseudo-sciences. It received a boost of respectability after mainstream authors such as Horacio Quiroga and Jorge Luis Borges used its elements in their writings. This, in turn, led to the permanent emergence of science fiction in the 1960s and mid 1970s, notably in Argentina, Brazil, Chile, Mexico, and Cuba. Magic realism enjoyed parallel growth in Latin America, with a strong regional emphasis on using the form to comment on social issues, similar to social science fiction and speculative fiction in the English world.
Economic turmoil and the suspicious eye of the dictatorial regimes in place reduced the genre's dynamism for the following decade. In the mid-1980s, it became increasingly popular once more. Although led by Argentina, Brazil and Mexico, Latin America now hosts dedicated communities and writers with an increasing use of regional elements to set them apart from English-language science-fiction.