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.

Type to find tags:
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Questions regarding the possible existence of other universes.
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Questions about observations performed without the aid of any optical instrument.
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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 the National Aeronautics and Space Administration, the American civilian space agency.
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Questions on celestial bodies that orbit planets.
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Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.
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A collection of ionized gases and dust in interstellar space
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Questions regarding Neptune, the 8th and furthest major planet orbiting Earth's sun.
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Questions regarding a family of extremely low-mass, electrically neutral particles described in the Standard Model of particle physics.
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Questions regarding a degenerate star that is mainly composed of neutrons.
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Questions regarding the theory of gravity as proposed by Newton, in which the force of gravity depends only on the mass of bodies, a constant, and the distance between them, and depends on one equatio…
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Questions about reflecting telescopes using a concave primary mirror and a flat diagonal secondary mirror.
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Questions regarding the action or process of observing a single object carefully to glean information.
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Questions regarding structures designed to aid in the observation of astronomical objects.
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Questions regarding the large "cloud" of small bodies that forms a sphere around the solar system.
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Questions regarding an object 'falling around' another object, due to a combination of gravity and momentum.
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Questions about the parameters needed to specify the characteristics of an orbit.
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Questions regarding the large-scale change of orbits over time, as in the Nice Model.
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A clockwork device that produces a small scale model of the orbits of objects in the solar system
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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.
Questions related to the unit of measurement, parsec, which is approximately 3.26 times the distance of a light year.
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the larger of Mars's two moons, being 11km in diameter. It is also the nearer to the planet's surface, and orbits the planet every 7 hours 39 minutes. It is predicted that within 50 million …
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Questions about photography of celestrial objects by amateur astronomers.