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 relatively inexpensive Newtonian telescope, in which the tube assembly slips freely in the lower base.
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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 regarding undesired brightening of the night sky inhibiting observation of astronomical objects.
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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 process of accurately finding your location, and getting to another place by planning and following a map.
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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 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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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 about the apparent displacement of a celestial body with respect to its background when observed along two different lines of sight.
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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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