Apocalyptic and post-apocalyptic fiction is a subgenre of science fiction 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 any other scenario in which the outcome is apocalyptic, such as a zombie apocalypse, cybernetic revolt, technological singularity, dysgenics or alien invasion.
Alien invasion or space invasion is a common feature in science fiction stories and film, in which extraterrestrial lifeforms invade the Earth to exterminate and supplant human life, enslave it, harvest people for food, steal the planet's resources, or destroy the planet altogether. It can be considered as a science-fiction subgenre of the invasion literature, expanded by H. G. Wells's seminal alien invasion novel The War of the Worlds.
Military science fiction is a subgenre of science fiction that depicts the use of science fiction technology, including spaceships and weapons, for military purposes and usually principal characters who are members of a military organization, usually during a war; occurring sometimes in outer space or on a different planet or planets. It exists in a range of media, including literature, comics, film, television and video games.
2300 AD, originally titled Traveller: 2300, is a tabletop science fiction role-playing game created by Game Designers' Workshop (GDW) and first published in 1986.
Footfall is a 1985 science fiction novel by American writers Larry Niven and Jerry Pournelle. The book depicts the arrival of members of an alien species called the Fithp that have traveled to the Solar System from Alpha Centauri in a large spacecraft driven by a Bussard ramjet. Their intent is conquest of the planet Earth.
A Deepness in the Sky is a science fiction novel by American writer Vernor Vinge. Published in 1999, the novel is a loose prequel to his earlier novel A Fire Upon the Deep (1992). The title is coined by one of the story's main characters in a debate, in a reference to the hibernating habits of his species and to the vastness of space.
The Uplift Universe is a fictional universe created by American science fiction writer David Brin. A central feature in this universe is the process of biological uplift.
Marooned in Realtime is a 1986 murder mystery and time-travel science fiction novel by American writer Vernor Vinge, about a small, time-displaced group of people who may be the only survivors of a technological singularity or alien invasion. It is the sequel to the novel The Peace War (1984) and the novella The Ungoverned (1985). Both novels and the novella were collected in Across Realtime.
The Worldwar series is the fan name given to a series of eight alternate history science fiction novels by Harry Turtledove. Its premise is an alien invasion of Earth during World War II, and includes Turtledove's Worldwar tetralogy, as well as the Colonization trilogy, and the novel Homeward Bound. The series' time span ranges from 1942 to 2031. The early series was nominated for a Sidewise Award for Alternate History in 1996.
First contact is a common science fiction theme about the first meeting between humans and extraterrestrial life, or of any sentient species' first encounter with another one, given they are from different planets or natural satellites. The theme allows writers to explore such topics such as xenophobia, transcendentalism, and basic linguistics by adapting the anthropological topic of first contact to extraterrestrial cultures.
The Xeelee Sequence is a series of hard science fiction novels, novellas, and short stories written by British science fiction author Stephen Baxter. The series spans billions of years of fictional history, centering on humanity's future expansion into the universe, its intergalactic war with an enigmatic and supremely powerful Kardashev Type IV alien civilization called the Xeelee, and the Xeelee's own cosmos-spanning war with dark matter entities called Photino Birds. The series features many other species and civilizations that play a prominent role, including the Squeem, the Qax, and the Silver Ghosts. Several stories in the Sequence also deal with humans and posthumans living in extreme conditions, such as at the heart of a neutron star (Flux), in a separate universe with considerably stronger gravity (Raft), and within eusocial hive societies (Coalescent).
Old Man's War is a military science fiction novel by American writer John Scalzi, published in 2005. His debut novel was nominated for the Hugo Award for Best Novel in 2006.
Worldwar: In the Balance is a 1994 alternate history novel by American writer Harry Turtledove. It is the first novel of the Worldwar tetralogy, as well as the first installment in the extended Worldwar series that includes the Colonization trilogy and the novel Homeward Bound. The plot begins in late 1941, while the Earth is torn apart by World War II. An alien fleet arrives to conquer the planet, forcing the warring nations to make uneasy alliances against the invaders. Meanwhile, the aliens, who refer to themselves as the Race, discover that their enemy is far fiercer and more technologically advanced than expected.
The Excalibur Alternative is a science fiction novel by American writer David Weber, published by Baen Books in 2002. It is one of several novels based on the premise of David Drake's 1986 novel Ranks of Bronze. This novel is based on the short story "Sir George and the Dragon", which appeared in the 2001 anthology Foreign Legions.
Ancient astronauts have been addressed frequently in science fiction and horror fiction. Occurrences in the genres include:
"Vilcabamba" is a 2010 science fiction short story by Harry Turtledove, notable both for its content and for the writer's unusual decision to publish it free online on tor.com and thus waive the royalties from its publication. The story would later be reprinted in Turtledove's short-story collection The Best of Harry Turtledove in 2021.
"The Fermi Paradox Is Our Business Model" is a science fiction short story by American writer Charlie Jane Anders. It was first published in the online magazine Tor.com August 11, 2010.
The Silurian hypothesis is a thought experiment which assesses modern science's ability to detect evidence of a prior advanced civilization, perhaps several million years ago. The most probable cues for such a civilization could be carbon, radioactive elements or temperature variation. The name "Silurian" derives from the eponymous sapient species from the BBC science fiction series Doctor Who, who in the series established an advanced civilization prior to humanity.
Bibliography of science fiction, fantasy, historical fiction and nonfiction writer Harry Turtledove:
