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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Questions about the observation of celestrial objects by non-professional astronomers.
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The corresponding particles of opposite charge to the particles of conventional matter (e.g. the positron is the antiparticle of the electron)
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an object that orbits another object. In space, satellites may be made by man, or they may be natural. Most man-made satellites also orbit the Earth, but some orbit other planets, such …
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Questions regarding relatively small rocky bodies in an orbit around the Sun.
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Questions related to techniques and equipment related to amateur to professional astronomical photography.
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Questions involving the physics of the universe, especially the nature of astronomical objects, energy fields, and/or regions, rather than their positions or motions in space.
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Questions regarding a layer of gasses surrounding a celestial object.
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Questions regarding the currently prevalent cosmological model for the origin of the universe.
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gravitationally linked and orbiting around their common center of mass.
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Questions regarding points of extremely high mass density, which creates an extremely strong gravitational field from which light cannot escape.
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Questions regarding Callisto, an icy moon of Jupiter.
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Questions regarding Charon, the largest satellite of the dwarf planet Pluto. Often considered to be Pluto's binary.
Questions regarding chthonians, a hypothesised class of exoplanets that are the remnant cores of hot Jupiters.