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 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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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 regarding the action of or an object rotating along an axis.
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Questions regarding an object orbiting around another object due to the force of gravity.
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Questions about Saturn, the 6th planet in Earth's solar system.
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Questions regarding the physical dimensions of a celestial object.
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Questions regarding the earthly Sun and objects orbiting it.
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