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 pertaining to natural satellites, such as our own Moon.
For questions that have to do with chemistry, chemical reactions be they biological or artificial, or the industrial processes of chemistry.
For questions dealing with how bodies interact with each other in space via gravitation.
For questions about rocks, minerals and the physical structure and substance of the world.
For questions about the development and usage of powers and abilities beyond what is "normal" for a specific species.
For questions concerning species that have settled on or near celestial bodies they are not native to and the challenges this presents.
For questions related to plants and vegetation in general.
For questions related to planets, moons, stars and other celestial objects, and their motion on the sky.
For questions about the physical structure of an organism.
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.
For questions related to the climate, temperature and precipitation that a world might experience. Compare [climate] and [seasons].
For questions relating to travel in time. Such travel may involve FTL travel; consider also using the [faster-than-light] tag.
For questions about groups of societies and their defining characteristics and achievements.
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.
For questions about cities, their systems and evolution.
For questions relating to the structure or relations regarding a fictional military or its parts.
For questions regarding the chemistry of living organisms.
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…
For questions about sources of power, generation, storage, how much is needed to perform different tasks, etc.
For questions about sources and types of nutrition for a living organism.
For questions about planet Earth as we know it. Changed Earths (extra moon, closer solar orbit, etc) should use the [earth-like] tag.
For questions dealing with events during an apocalypse scenario. Do not use for post-apocalyptic settings.
For questions about the written or spoken language of a world.
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.
For questions about luminous spheres of plasma held together by their own gravity, generally comprised primarily of hydrogen and helium.
For questions involving dragons - generally large, reptilian, flying creatures famous in folklore and myths.
For questions regarding the impact of religion in a given scenario or the creation of a religion for use in a fictional world.
For questions regarding the properties and applications of both fictional and real materials.
For questions regarding artificial structures that exist in space.
For questions relating to the exchange of ideas and information between beings.
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 …
For questions based on computers and other like devices having human-like intelligence.
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…
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…
For questions relating to the thoughts and decision making processes of beings.
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…