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.
811 questions
8 asked this month, 117 this year
Questions regarding the closest star to Earth, at the centre of the Solar System.
641 questions
5 asked this month, 105 this year
Questions about the techniques and practice of observing the night sky.
635 questions
10 asked this week, 33 this month
Questions regarding points of extremely high mass density, which creates an extremely strong gravitational field from which light cannot escape.
584 questions
7 asked this month, 75 this year
Questions regarding an object 'falling around' another object, due to a combination of gravity and momentum.
573 questions
8 asked this month, 74 this year
Questions regarding Earth's only natural satellite. For questions about the natural satellites of other planets, use the tag [natural-satellite].
559 questions
9 asked this month, 89 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.
554 questions
8 asked this month, 66 this year
Questions regarding systems of large numbers of stars held together by gravity.
503 questions
7 asked this month, 89 this year
Questions regarding the Sun and objects orbiting it.
484 questions
87 asked this year
Questions related to the physical instruments for astronomical observations.
463 questions
5 asked this week, 10 this month
Questions regarding the attractive force which exists between any two bodies of matter.
454 questions
9 asked this month, 58 this year
Questions regarding the planet on which humans live; the third planet from the Sun.
436 questions
6 asked this month, 55 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.
397 questions
12 asked this month, 85 this year
Questions about the observation of celestial objects by non-professional astronomers.
366 questions
10 asked this month, 90 this year
Questions regarding planets that lie outside the Solar System.
332 questions
9 asked this month, 70 this year
Questions about the origin, history, evolution and fate of the Universe.
331 questions
11 asked this month, 76 this year
Questions regarding all of time and space and its contents.
300 questions
36 asked this year
Questions regarding electromagnetic radiation in the visible spectrum.
273 questions
28 asked this year
Questions regarding relatively small rocky bodies in an orbit around the Sun.
240 questions
29 asked this year
Questions regarding the amount of space between two objects, the units, or measurement thereof.
223 questions
40 asked this year
Questions about observations performed in the radio frequency range of the electromagnetic spectrum.
212 questions
13 asked this month, 58 this year
Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.
193 questions
24 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…
192 questions
43 asked this year
Questions regarding the 4-dimensional background structure of our universe.
180 questions
20 asked this year
Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.
179 questions
40 asked this year
Questions regarding stars which increase suddenly in energy output due to an explosion which ejected much of its mass.
173 questions
34 asked this year
Questions regarding Mars, the fourth planet from the Sun.
173 questions
10 asked this month, 51 this year
The application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft.
172 questions
66 asked this year
Questions regarding the action of or an object rotating along an axis.
166 questions
30 asked this year
Questions regarding a layer of gasses surrounding a celestial object.
164 questions
5 asked this month, 24 this year
Questions about relativistic theory of gravity. General relativity describes gravity as a geometrical property of space and time.
162 questions
24 asked this year
Questions regarding the history of astronomy, including discoveries and scientists.
162 questions
12 asked this month, 48 this year
Questions regarding Jupiter, the 5th and largest planet in the Solar System.
160 questions
28 asked this year
Questions on celestial bodies that orbit planets.
158 questions
35 asked this year
Questions about the increase with time of distance between two distant points in the Universe.
157 questions
25 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…
155 questions
38 asked this year
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