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 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.
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 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).
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Question related to light or other electromagnetic radiation from an object moving away from the observer is increased in wavelength, or shifted to the red end of the spectrum.
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Questions regarding the action of or an object rotating along an axis.
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Questions about Saturn, the 6th planet in Earth's solar system.