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.
For questions regarding the day-night cycle of a day on a world. Usually regarding the dark-light cycle.
For questions dealing with things that happen beneath the surface of the planet or other celestial body, except for things that happen in water (use [underwater] for that).
For questions about instantaneously or near-instantaneously transporting an object from one location to another.
For questions about mathematics, including our own system of mathematics and alien versions of mathematics, focusing on their effects on societies and civilizations.
For questions involving the fundamental electromagnetic force. This includes electricity, magnetism, light, and other phenomena.
For questions relating to gas giants: large planets composed of gases (usually mostly hydrogen and helium).
should be used when planning on long term objectives. Depending on your needs, this can be used with economic, military, political goals, etc.
For questions involving volcanoes, volcanic eruptions, and related phenomena, whether or Earth or elsewhere.
For questions related to vampires, imaginary undead beings generally assumed to subsist by means of fresh human blood.
For questions about the use of a mobile space station used to colonize the stars. A generation ship travels well below the speed of light and relies on natural processes of reproduction to support the…
For questions about the changes to a species of fauna or flora over multiple generations by intelligent beings, often for the purposes of harnessing the abilities of the species in question, usually t…
distribute time into certain periods adapted to the purposes of common life, as hours, days, weeks, months, years, etc.
For question about anything that can be used as a power source for a planet or civilization.
Questions dealing with creatures that have the ability to change their body form into someone or something else, voluntarily or involuntarily. Consider also the [chimera-folk] tag.
For questions that refer in general to the violent expenditure of energy in a specific area that is typically referred to as an explosion.
For questions that have to do with dinosaurs, excluding their living avian descendants.
Questions for incorporating fantastical elements into the modern world (20th century or later), with an emphasis on cities.
For questions about society's worst possible state, its components and consequences.
For questions concerning trans-humanism as a philosophical movement, and the drive towards developing and making widely available technologies to greatly enhance human intellectual, physical, and psyc…
Mythology should be used for questions involving stories or the origin of stories which will be important to some culture.
For questions about the social identification of individuals toward masculinity, femininity or else.
For questions about the diagnosis, treatment, and prevention of disease and injury.
For questions about utilizing asteroids, asteroids impacts and asteroids physical properties.
For questions about politics at a larger-than-nation-state scale. These may include questions about relations between superpowers, entities similar to the United Nations, the functioning of a single w…
should be used for questions specifically asking about the nuclear weapons. The question can be about the usage in war, its construction under certain circumstances or its effects in a given …
For questions about any non-flowing body of water in general. Rivers should use the [rivers] tag.
For questions about birds and birdlike creatures. Does not include machines designed for flying (consider [airships], [aircraft], [spaceships]). Consider also [flight].
For questions about the formation and existence of deserts, how civilizations survive in them, creatures of the desert, and related topics.
For questions about implemented technology that can be used for transportation. For questions about the act of transportation, consider using [transportation] instead.
For questions about blood, its use in the circulatory system, its effect and what would happen if it was changed.