List of science fiction themes
From Wikipedia, the free encyclopedia
The following is a list of recurring themes in science fiction.
Overarching themes 
- Creation of the Universe
- The future 
- History 
- Military science fiction: strategy, weapons, ranks, technologies
- Omega Point
- Parallel worlds or universes.
- There is a space based civilization variant of this theme. This plot device allows writers to write soft science fiction while accounting for the lack of technological advancement and thus similarity to the present day.
- Quantum suicide and immortality
- Religious ideas in science fiction
- Sci fantasy
- Sci horror
- Sex and sexuality (including gender roles, polygamy, human sexuality and procreation)
- Sociology and sociobiology
- Space Opera
- Alternative intelligences
- Beings of pure mentality
- Hive minds
- Infomorphs—memories, characters, and consciences of persons being uploaded to a computer or storage media
- Noosphere—the "sphere of human thought"
- Solipsism & Solipsism syndrome—the idea that one's own mind is all that exists.
- Artificial intelligence
- Extraterrestrial life (see Extraterrestrial life in culture)
- Living planets (both sentient and non-sentient)
- Uplifted animals—using technology to "raise" non-human animals to human evolutionary levels
Body and mind alterations 
- Intelligence amplification
- Life extension, Biological immortality, Universal immortalism and immortality
- Mind interfacing
- Molecular manufacturing & Nanotechnology (nanomilitary, nanomaterials, nanoecology, nanomedicine, nanocomputing, nanospace, nanoenergy)
- Psi powers and psychic phenomena
- Paradise engineering
- Resizing (size-changing, miniaturization, magnification, shrinking, and enlargement)
- Alien Zoo, a zoo where humans are kept as exhibits.
- Arcologies—enormous habitats (hyperstructures) of extremely high human population density
- Domed city
- Exploring alien habitats.
- Floating City
- Seasteading & Ocean colonization
- Reality Television
- An Earth-bound reality game where losing contestants are killed.
- The protagonist discovers their life has been one big reality television show for aliens.
- Space colonization
- Underground city
- Walking City
Political structures 
- Alien Contact
- Anarcho-capitalism (see: Anarcho-capitalist literature and Libertarian science fiction)
- Dystopias and utopias
- Galactic empires
- Interstellar federation of planets
- Legal personality
- Limited-franchise republic
- Mind reading and mind control
- National security state
- Proportional representation
- Totalitarianism vs. Libertarianism (see: Libertarian science fiction)
- World government
- Zero population growth
Possible futures 
- Alien invasions
- Apocalypses or world wide disasters
- Post-apocalyptic life: new societies that develop after the event
- Race of the Future
- Ultimate fate of the Universe & Kardashev scale
- Artificial gravity
- Artificial intelligence
- Astronomical engineering
- Self-replicating machines
- Star lifting & Stellar engineering
- Megascale engineering & Planetary engineering
- Alien technology being found and used by humans.
- Far advanced technology for the time.
- Virtual reality and simulated reality
- Weapons in science fiction
- Colonization of other planets, moons, asteroids, etc.
- Moving planets
- Space exploration
- Time travel
- Alternate histories: time travel can be used as a plot device to explore parallel universes. While alternate history has its own category (see above), it often occurs in time travel stories as well.
- The Grandfather paradox: can someone go back in time and kill his parents before they beget the killer?
- Time loop
- Travel to the Earth's center
See also