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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.

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For questions relating to travel in time. Such travel often involves FTL travel; consider also using the [tag:faster-than-light] tag.
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For questions dealing with how bodies interact with each other in space via gravitation.
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are concerning people living in space who are non-native to space.
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For questions related to planets, moons, stars and other celestial objects, and their motion on the sky.
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For questions concerning the immediate future, where technology is assumed to have advanced slightly while still recognizable to modern humans. Questions utilizing this tag should focus on a particul…
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For questions dealing with events during an apocalypse scenario. Do not use for post-apocalyptic settings.
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For questions about groups of societies and their defining characteristics and achievements.
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For questions about rocks, minerals and the physical structure and substance of the world.
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For questions about the development and usage of powers and abilities beyond what is "normal" for a specific species.
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For questions related to plants and vegetation in general.
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For questions about planet Earth as we know it. Changed Earths (extra moon, closer solar orbit, etc) should use the [earth-like] tag.
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For questions relating to peoples or sentient beings that are often found in the fantasy subgenre of fiction, such as elves, dwarves, etc. This can be about their physical characteristics, their socie…
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For questions about cities, their systems and evolution.
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For questions related to the climate, temperature and precipitation that a world might experience. Compare [climate] and [seasons].
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For questions about the written or spoken language of a world.
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For questions relating to the exchange of ideas and information between beings.
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For questions regarding the impact of religion in a given scenario or the creation of a religion for use in a fictional world.
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For questions about animals or non-sentient beings that are not found on Earth. These can be anything from dragons to Pegasus to your own made-up creature. They just need to not exist on this Earth.
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For questions that have to do with chemistry, chemical reactions be they biological or artificial, or the industrial processes of chemistry.
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For questions about worlds other than Earth that are significantly different. This could be a water, ice, barren or other planet. For questions about planets similar to Earth with specific differenc…
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For questions about sources and types of nutrition for a living organism.
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For questions about the viability of life in certain conditions. For example, it could be used in questions asking about the possibility of life on a planet or other astronomical body.
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For questions based on computers and other like devices having human-like intelligence.
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For questions regarding artificial structures that exist in space.
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For questions about the process of creating a new world or changing and developing an existing one, as opposed to questions about some element of the world being created or changed. NOTE that this is …
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For questions about sources of power, generation, storage, how much is needed to perform different tasks, etc.
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For questions about the use of engineering to create structures and devices in other worlds, including whether or not a device could be made or what materials would be needed to make a device.
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Questions about science and the perception of science in a fictional world. Use [science-based] for questions on how to explain fictional things based on real-world science. Use tags relating to speci…
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For questions about luminous spheres of plasma held together by their own gravity, generally comprised primarily of hydrogen and helium.
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For questions relating to the thoughts and decision making processes of beings.
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For questions related to the sets of rules set in place by organizations to govern the behaviour of the people.
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Intended to refer to the properties of both hypothetical and real materials and their applications and properties.
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For questions relating to the structure or relations regarding a fictional military or its parts.
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For use with questions that have to do with the process of buildings structures or habitats.
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For questions about the physical structure of an organism.
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For questions about a way to pass on biological information from one generation to the next.