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 gas-giant planets in very close orbit to their parent star (closer than Mercury).
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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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Questions about Europa, a moon of Jupiter with a planet-wide ocean under a thick ice crust.
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track and display the current time.
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Questions about Trojan Asteroids, asteroids that co-orbit major planets.
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Questions related to Astropy, a community Python package for Astronomy
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Questions about the speed at which an object can go to a point at infinity while ending at rest.
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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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about the lack of evidence for alien life, despite the growing evidence that suitable planets are reasonably plentiful.
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