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 reflecting telescopes using a concave primary mirror and a flat diagonal secondary mirror.
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Questions regarding the action or process of observing a single object carefully to glean information.
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Questions regarding structures designed to aid in the observation of astronomical objects.
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Questions regarding the large "cloud" of small bodies that forms a sphere around the solar system.
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Questions regarding an object 'falling around' another object, due to a combination of gravity and momentum.
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Questions regarding the large-scale change of orbits over time, as in the Nice Model.
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A clockwork device that produces a small scale model of the orbits of objects in the solar system
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Questions about the apparent displacement of a celestial body with respect to its background when observed along two different lines of sight.
Questions related to the unit of measurement, parsec, which is approximately 3.26 times the distance of a light year.
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Questions about photography of celestrial objects by amateur astronomers.
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Questions on astronomical objects orbiting a star massive enough to be rounded, not massive enough to cause fusion, and which have cleared its orbit of planetesimals.
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Questions about the processes, theories and evidence for the formation of planetary bodies.
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Questions about rings of debris that encircle the equatorial regions of some planets.
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Questions regarding celestial bodies in orbit around a star.
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Questions regarding the former 9th (now dwarf) planet Pluto.
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Questions about the early phases of the star formation process. A protostar is a large mass of gas that results of the contraction of a molecular cloud.
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Questions regarding celestial objects which emit regular pulses of electromagnetic energy.
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