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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 circumstellar disk orbiting in the outer Solar System, beyond the orbit of Neptune.
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Questions about the simplest and most abundant element in the Universe.
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Questions regarding grouping objects together based on one or more shared property.
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Questions regarding the material at or near the center of an astronomical object.
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Questions regarding undesired brightening of the night sky inhibiting observation of astronomical objects.
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Questions regarding the space or objects outside of galaxies.
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Questions regarding matter in its gaseous state, and how it behaves in astronomy (e.g. forming stars in giant molecular clouds).
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flashes of gamma rays, produced by extremely powerful explosions in distant galaxies. They are among the most powerful events in the universe
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Questions about orbits with high eccentricities, which deviate greatly from perfect circles.
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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 about spacecraft journeying to other stellar systems.
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Questions to do with how new atomic nuclei are created inside the universe.
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Inclination defines the angle between the plane of the orbit of a planet or comet and another plane, usually that of the ecliptic.
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Questions regarding atmospheric conditions on either Earth or on other planets.
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Questions regarding thermal energy and its effect on astronomical objects.
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Questions about Titan, the largest moon of Saturn.
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Questions regarding the future and ultimate fate of the Universe, including the heat death, Big Freeze, Big Rip, or Big Crunch.
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a planet that has a compact rocky surface like the Earth's; the four innermost planets in the solar system.
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Questions related to earth processes or related processes and principles.
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Questions about the "adulthood" of stars. The main sequence is a distinctive band of stars that appears in a color-magnitude plot (known as Hertzsprung-Russell diagram). Stars appear in the main seque…
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Questions about large, dense, massive collections of stars orbiting galaxies, thought to have formed in the early universe.
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