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 gas that lays between stars in 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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Questions regarding the brightness of an object.
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The corresponding particles of opposite charge to the particles of conventional matter (e.g. the positron is the antiparticle of the electron)
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a relatively inexpensive Newtonian telescope, in which the tube assembly slips freely in the lower base.
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Questions about Titan, the largest moon of Saturn.
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Questions regarding structures designed to aid in the observation of astronomical objects.
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Questions regarding the large-scale change of orbits over time, as in the Nice Model.
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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 regarding atmospheric conditions on either Earth or on other planets.
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Questions about volcanic processes and observations.
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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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A measure of the ratio of an object's mass with its volume.
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Second lightest element in the periodic table
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about the lack of evidence for alien life, despite the growing evidence that suitable planets are reasonably plentiful.
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Questions about Europa, a moon of Jupiter with a planet-wide ocean under a thick ice crust.
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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 Charon, the largest satellite of the dwarf planet Pluto. Often considered to be Pluto's binary.