Alternate history is a genre of speculative fiction of stories in which one or more historical events occur and are resolved differently than they were in real life. As conjecture based upon historical fact, alternative history stories propose What if? scenarios about crucial events in human history, and present outcomes very different from the historical record. Alternate history also is a subgenre of literary fiction, science fiction, and historical fiction; as literature, alternate history uses the tropes of the genre to answer the What if? speculations of the story.
A future history is a postulated history of the future and is used by authors of science fiction and other speculative fiction to construct a common background for fiction. Sometimes the author publishes a timeline of events in the history, while other times the reader can reconstruct the order of the stories from information provided therein.
Rocket Ship Galileo, a juvenile science-fiction novel by the American writer Robert A. Heinlein, published in 1947, features three teenagers who participate in a pioneering flight to the Moon. It was the first in the Heinlein juveniles, a long and successful series of science-fiction novels published by Scribner's. Heinlein originally envisioned the novel as the first of a series of books called "Young Rocket Engineers". Publishers initially rejected the script, judging going to the moon as "too far out".
Apocalyptic and post-apocalyptic fiction is a subgenre of science fiction, science fantasy, dystopia or horror in which the Earth's civilization is collapsing or has collapsed. The apocalypse event may be climatic, such as runaway climate change; astronomical, such as an impact event; destructive, such as nuclear holocaust or resource depletion; medical, such as a pandemic, whether natural or human-caused; end time, such as the Last Judgment, Second Coming or Ragnarök; or more imaginative, such as a zombie apocalypse, cybernetic revolt, technological singularity, dysgenics or alien invasion.
Science fiction is a film genre that uses speculative, fictional science-based depictions of phenomena that are not fully accepted by mainstream science, such as extraterrestrial lifeforms, spacecraft, robots, cyborgs, interstellar travel or other technologies. Science fiction films have often been used to focus on political or social issues, and to explore philosophical issues like the human condition.
A doomsday device is a hypothetical construction — usually a weapon or weapons system — which could destroy all life on a planet, particularly Earth, or destroy the planet itself, bringing "doomsday", a term used for the end of planet Earth. Most hypothetical constructions rely on hydrogen bombs being made arbitrarily large, assuming there are no concerns about delivering them to a target or that they can be "salted" with materials designed to create long-lasting and hazardous fallout.
Scientific romance is an archaic, mainly British term for the genre of fiction now commonly known as science fiction. The term originated in the 1850s to describe both fiction and elements of scientific writing, but it has since come to refer to the science fiction of the late nineteenth and early twentieth centuries, primarily that of Jules Verne, H. G. Wells and Arthur Conan Doyle. In recent years the term has come to be applied to science fiction written in a deliberately anachronistic style as a homage to or pastiche of the original scientific romances.
From the Earth to the Moon: A Direct Route in 97 Hours, 20 Minutes is an 1865 novel by Jules Verne. It tells the story of the Baltimore Gun Club, a post-American Civil War society of weapons enthusiasts, and their attempts to build an enormous Columbiad space gun and launch three people—the Gun Club's president, his Philadelphian armor-making rival, and a French poet—in a projectile with the goal of a Moon landing. Five years later, Verne wrote a sequel called Around the Moon.
Strange and exotic weapons are a recurring feature in science fiction. In some cases, weapons first introduced in science fiction have been made a reality; other science-fiction weapons remain purely fictional, and are often beyond the realms of known physical possibility.
The submarine film is a subgenre of war film in which the majority of the plot revolves around a submarine below the ocean's surface. Films of this subgenre typically focus on a small but determined crew of submariners battling against enemy submarines or submarine-hunter ships, or against other problems ranging from disputes amongst the crew, threats of mutiny, life-threatening mechanical breakdowns, or the daily difficulties of living on a submarine.
Fantastic Voyage is a 1966 American science fiction adventure film directed by Richard Fleischer and written by Harry Kleiner, based on a story by Otto Klement and Jerome Bixby. The film is about a submarine crew who are shrunk to microscopic size and venture into the body of an injured scientist to repair damage to his brain. Kleiner abandoned all but the concept of miniaturization and added a Cold War element. The film starred Stephen Boyd, Raquel Welch, Edmond O'Brien, Donald Pleasence, and Arthur Kennedy.
Since their public debut in August 1945, nuclear weapons and their potential effects have been a recurring motif in popular culture, to the extent that the decades of the Cold War are often referred to as the "atomic age".
The Moon has appeared in fiction as a setting since at least classical antiquity. Throughout most of literary history, a significant portion of works depicting lunar voyages has been satirical in nature. From the late 1800s onwards, science fiction has successively focused largely on the themes of life on the Moon, first Moon landings, and lunar colonization.
The Iron Dream is a metafictional 1972 alternate history novel by American author Norman Spinrad. The book has a nested narrative that tells a story within a story. On the surface, the novel presents a post-apocalyptic adventure tale entitled Lord of the Swastika, written by an alternate-history Adolf Hitler shortly before his death in 1953. In this timeline, Hitler emigrated from Germany to the United States in 1919 after the Great War, and used his modest artistic skills to become first a pulp–science fiction illustrator and later a successful writer, telling lurid, purple-prosed, pro-fascism stories under a thin science fiction veneer. The nested narrative is followed by a faux scholarly analysis by a fictional literary critic Homer Whipple which is said to have been written in 1959.
The history of science fiction films parallels that of the motion picture industry as a whole, although it took several decades before the genre was taken seriously. Since the 1960s, major science fiction films have succeeded in pulling in large audience shares, and films of this genre have become a regular staple of the film industry. Science fiction films have led the way in special effects technology, and have also been used as a vehicle for social commentary.
Subterranean fiction is a subgenre of adventure fiction, science fiction, or fantasy which focuses on fictional underground settings, sometimes at the center of the Earth or otherwise deep below the surface. The genre is based on, and has in turn influenced, the Hollow Earth theory. The earliest works in the genre were Enlightenment-era philosophical or allegorical works, in which the underground setting was often largely incidental. In the late 19th century, however, more pseudoscientific or proto-science-fictional motifs gained prevalence. Common themes have included a depiction of the underground world as more primitive than the surface, either culturally, technologically or biologically, or in some combination thereof. The former cases usually see the setting used as a venue for sword-and-sorcery fiction, while the latter often features cryptids or creatures extinct on the surface, such as dinosaurs or archaic humans. A less frequent theme has the underground world much more technologically advanced than the surface one, typically either as the refugium of a lost civilization, or as a secret base for space aliens.
Science fiction opera is a subgenre of science fiction. It refers to operas whose subject-matter fits in the science fiction genre. Like science-fiction literature, science-fiction operas may be set in the future and involve spaceflight or alien invasion. Other science-fiction operas focus on a dystopian view of the future. Like Lorin Maazel's opera 1984, they may be based on a previously written science fiction book.
Colonization: Aftershocks is an alternate history and science fiction novel by Harry Turtledove. It is the third and final novel of the Colonization series and the seventh installment in the extended Worldwar series.
