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 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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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.
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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 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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Questions about observation performed in the radio frequency range of the electromagnetic spectrum (between 10 MHz and 1GHz).
Tag for questions asking if fictional ideas are possible or correct
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Questions related to the phenomenon whereby electromagnetic radiation (such as visible light) generated by an object moving away from an observer will have increased in wavelength (i.e. shifted toward…
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Questions about planets that do not orbit around a star. These planets travel through space.