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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A measure of the ratio of an object's mass with its volume.
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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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is used for questions regarding the subject of taking photographs of the night sky using digital or film imaging systems as well as the development and processing of the images. Que…
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Questions regarding the process of assigning an identifying set of characters to an astronomical object.
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Questions regarding Neptune, the 8th and furthest major planet orbiting Earth's sun.
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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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using this tag please consider whether your question would be more appropriate on the space exploration stack exchange.
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Questions regarding a manmade object sent to explore space and celestial objects.
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Questions to do with how new atomic nuclei are created inside the universe.
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Questions regarding the space or objects outside of galaxies.
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Questions regarding undesired brightening of the night sky inhibiting observation of astronomical objects.
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Questions about orbits with high eccentricities, which deviate greatly from perfect circles.
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like stars but never achieve nuclear fusion because they are too low-mass.
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Questions regarding Charon, the largest satellite of the dwarf planet Pluto. Often considered to be Pluto's binary.
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Questions about the large ring of rocky bodies between Mars and Jupiter.
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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 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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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 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 volcanic processes and observations.
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Questions about Titan, the largest moon of Saturn.