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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.

Questions regarding the movement of a celestial body that is in the opposite direction of another celestial body the original one is orbiting.
Questions regarding non-baryonic matter, most notably, matter with negative mass or imaginary mass, such as tachyons.
Tag used for topics related to drizzle-integration (a super-sampling algorithm for stacking images)
a special tag that is designed to be used only by the system for questions that have had all of their other tags removed. Do not add this tag to existing questions, it is reserved for use by t…
A clockwork device that produces a small scale model of the orbits of objects in the solar system
Questions regarding Callisto, an icy moon of Jupiter.