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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

× 184
For questions about the standard passage of time on objects/people/civilisations etc. Also consider the [time-keeping], [spacetime-dimensions], [alternate-history], [universe], [time-travel], or [time…
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For questions dealing with the past events of a given world.
× 177
For questions regarding a device that can be programmed to carry out a set of certain set of tasks without external intervention.
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For questions based in contemporary Earth, current technology and social norms.
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For questions involving dragons - generally large, reptilian, flying creatures famous in folklore and myths.
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For questions regarding a star and the area comprising its gravitational dominance. While they are not part of its technical definition, it colloquially refers to the planets, moons, asteroids and ot…
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For questions regarding the aesthetic elements of construction and design. It can apply to any historical period or complexity level, from earthen mounds to grand cathedrals.
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For questions regarding the chemistry of living organisms.
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For questions about machines (esp. programmable machines) capable of carrying out complex tasks.
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For questions on population sizes, maximums and minimums, how they are affected by different events, etc.
× 160
For questions related to the act or process of flying through an atmosphere. Includes any means of propelling oneself through the atmosphere of a world, including biological or technological. Does not…
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For questions related to a disorder (illness, disease and sickness) that affects the function or structure of an organism.
× 157
For questions regarding the generation or flow of electrical charge.
× 156
For questions about the act or process of transporting something or someone from one location to another, including by technological or non-technological means. For questions about the specific machin…
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For questions involving the specifics of combat.
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For questions about events occurring below the surface of a body of water.
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different than it is in real life. This may range from small, historical changes to absolute revisions of the laws of physics.
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For questions about the process of turning a barren space (such as a planet, moon, or asteroid) into a habitable one.
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For question about creatures whose appearance is similar to that of humans. The creatures in the question should be different from normal humans in at least one way but can still be seen as mainly hum…
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For questions about the means and methods any species, organism or entity uses to propagate itself.
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For questions that deal with weapons of mass destruction (WMD).
× 141
For questions about strategies and structures for defending from a particular type of attack
× 141
For questions about the planet Mars. This includes development, life on Mars, and comparisons to other planet types.
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For questions about undead creatures, typically depicted as mindless, reanimated human corpses with a hunger for human flesh.
× 139
For questions trying to understand the different possibilities for the future of Earth.
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For questions about the movement of people between locations, includes migration.
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For questions that involve outer protective coverings used for the defense of biological creatures.
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For questions about artificially modifying the DNA of a life form.
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For questions asking about the conditions which are required for the development of life as we know it.
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For questions that have to do with the liquid form of H2O.
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For questions about treatment methods as well as substances used to heal wounds and cure diseases.
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set in an era corresponding to a level of technology between the invention of writing and the fall of the Western Roman Empire in 476 AD.
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For questions that deal with the natural resources found in the environment.
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For questions about settings in which superluminal travel and/or communication is a possibility.
× 120
For questions about a region of space time where gravity is so strong that nothing, not even light, can escape it.
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For questions seeking resources intended to help people with building a fictional world, such as books and software relating to worldbuilding itself (rather than the world that is being built). Consid…