Astronomy Beta

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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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Popular Name New
Questions regarding large spheres of plasma undergoing fusion.
847 questions
7 asked this week, 20 this month
Questions about the techniques and practice of observing the night sky.
678 questions
19 asked this month, 225 this year
Questions regarding the closest star to Earth, at the centre of the Solar System.
663 questions
13 asked this month, 116 this year
Questions regarding points of extremely high mass density, which creates an extremely strong gravitational field from which light cannot escape.
600 questions
7 asked this month, 79 this year
Questions regarding an object 'falling around' another object, due to a combination of gravity and momentum.
592 questions
13 asked this month, 80 this year
Questions regarding Earth's only natural satellite. For questions about the natural satellites of other planets, use the tag [natural-satellite].
575 questions
8 asked this month, 96 this year
Questions on astronomical objects orbiting a star massive enough to be rounded, not massive enough to cause fusion, and which have cleared its orbit of planetesimals.
568 questions
10 asked this month, 71 this year
Questions regarding systems of large numbers of stars held together by gravity.
523 questions
11 asked this month, 98 this year
Questions regarding the Sun and objects orbiting it.
495 questions
9 asked this month, 91 this year
Questions related to the physical instruments for astronomical observations.
493 questions
16 asked this month, 93 this year
Questions regarding the attractive force which exists between any two bodies of matter.
469 questions
11 asked this month, 66 this year
Questions regarding the planet on which humans live; the third planet from the Sun.
444 questions
5 asked this month, 56 this year
Questions involving the physics of the universe, especially the nature of astronomical objects, energy fields, and/or regions, rather than their positions or motions in space.
416 questions
5 asked this week, 11 this month
Questions about the observation of celestial objects by non-professional astronomers.
384 questions
8 asked this month, 99 this year
Questions about the origin, history, evolution and fate of the Universe.
348 questions
81 asked this year
Questions regarding planets that lie outside the Solar System.
341 questions
5 asked this month, 71 this year
Questions regarding all of time and space and its contents.
306 questions
37 asked this year
Questions regarding electromagnetic radiation in the visible spectrum.
277 questions
27 asked this year
Questions regarding relatively small rocky bodies in an orbit around the Sun.
245 questions
28 asked this year
Questions regarding the amount of space between two objects, the units, or measurement thereof.
237 questions
8 asked this month, 50 this year
Questions about observations performed in the radio frequency range of the electromagnetic spectrum.
223 questions
63 asked this year
Questions about photography of celestial objects by amateur or professional astronomers. Questions about photography of other objects are off-topic but might be asked on our sister site Photography St…
200 questions
42 asked this year
Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.
197 questions
24 asked this year
The application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft.
191 questions
10 asked this month, 78 this year
Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.
186 questions
37 asked this year
Questions regarding the 4-dimensional background structure of our universe.
184 questions
20 asked this year
Questions regarding Mars, the fourth planet from the Sun.
182 questions
5 asked this month, 57 this year
Questions regarding the history of astronomy, including discoveries and scientists.
178 questions
9 asked this month, 64 this year
Questions regarding stars which increase suddenly in energy output due to an explosion which ejected much of its mass.
177 questions
35 asked this year
Questions regarding a layer of gasses surrounding a celestial object.
170 questions
29 asked this year
Questions regarding the action of or an object rotating along an axis.
170 questions
33 asked this year
Questions regarding Jupiter, the 5th and largest planet in the Solar System.
169 questions
36 asked this year
Questions on celestial bodies that orbit planets.
167 questions
5 asked this month, 40 this year
Questions about relativistic theory of gravity. General relativity describes gravity as a geometrical property of space and time.
166 questions
28 asked this year
Icy bodies that usually consist of methane, water, and other materials that originate from beyond the jovian planets, and occasionally fall into the inner solar system giving off a massive tail as mat…
164 questions
5 asked this month, 44 this year
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.
163 questions
5 asked this month, 22 this year
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