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 patterns formed by group of prominent stars in the night sky.
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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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A measure of the ratio of an object's mass with its volume.
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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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track and display the current time.
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Questions about gas-giant planets in very close orbit to their parent star (closer than Mercury).
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Late Heavy Bombardment; occurring between 3.7-4 billion years ago when the inner solar system underwent heavy asteroidal impacts. Also know as the Lunar Cataclysm.
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Questions regarding undesired brightening of the night sky inhibiting observation of astronomical objects.
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the group of galaxies that includes the Milky Way among others.
Questions related to Kuiper Belt Objects that exist in an annulus from 30AU to approximately 50AU from the Earth's Sun.
Questions regarding Callisto, an icy moon of Jupiter.