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 regarding the physical dimensions of a celestial object.
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Questions about computer programs that assist modeling and observing the dynamics of astronomy.
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Questions about the complete or partial blocking of the sun by the moon.
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Questions regarding the earthly Sun and objects orbiting it.
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Questions regarding the Sombrero Galaxy, also known as M104 or NGC 4594. It is an unbarred spiral galaxy, part of the Virgo constellation.
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The near-vacuum extending between the planets and stars, containing small amounts of gas and dust. Also called outer space to refer to the physical universe beyond the Earth's atmosphere.
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Space debris (also known as "orbital debris", "space junk", or "space waste") is the collection of defunct objects in orbit around Earth and includes everything from spent rocket stages, old satellite…
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Questions regarding a manmade object sent to explore space and celestial objects.
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Questions regarding telescopes in orbit around Earth, such as the Hubble Space Telescope.
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Questions regarding the 4-dimensional background structure of our universe.
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Questions regarding Albert Einstein's theory that posits, among other things, the equivalence of mass and energy.
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Questions about the observed frequency range of the electromagnetic radiation of a celestrial object.
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Questions regarding an object's movement, or its distance traveled relative to the time taken.
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Questions regarding large spheres of gas undergoing fusion.
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Questions related to the physical processes involved in or to the observations of the process of forming a star.
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Questions regarding casually watching the stars.
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Questions regarding one or more stars and the objects they locally interact with, including each other.
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Stellar dynamics describe the branch of astronomy that studies the regularities in the motions of stars in gravitational fields of a stellar systems, as well as the evolution of stellar systems.