Astronomy

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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.
1086 questions
8 asked this month, 127 this year
Questions about the techniques and practice of observing the night sky.
1075 questions
8 asked this month, 263 this year
Questions regarding the closest star to Earth, at the centre of the Solar System.
805 questions
5 asked this month, 92 this year
Questions regarding points of extremely high mass density, which creates an extremely strong gravitational field from which light cannot escape.
737 questions
5 asked this month, 99 this year
Questions regarding an object 'falling around' another object, due to a combination of gravity and momentum.
720 questions
6 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].
707 questions
71 asked 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.
687 questions
67 asked this year
Questions regarding systems of large numbers of stars held together by gravity.
654 questions
5 asked this week, 11 this month
Questions related to the physical instruments for astronomical observations.
625 questions
5 asked this month, 80 this year
Questions regarding the Sun and objects orbiting it.
608 questions
5 asked this month, 68 this year
Questions regarding the attractive force which exists between any two bodies of matter.
555 questions
6 asked this month, 64 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.
536 questions
74 asked this year
Questions regarding the planet on which humans live; the third planet from the Sun.
523 questions
50 asked this year
Questions about the observation of celestial objects by non-professional astronomers.
505 questions
71 asked this year
Questions about the origin, history, evolution and fate of the Universe.
451 questions
5 asked this month, 82 this year
Questions regarding planets that lie outside the Solar System.
441 questions
62 asked this year
Questions regarding all of time and space and its contents.
335 questions
19 asked this year
Questions regarding electromagnetic radiation in the visible spectrum.
318 questions
26 asked this year
Questions regarding relatively small rocky bodies in an orbit around the Sun.
307 questions
38 asked this year
The application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft.
303 questions
5 asked this month, 69 this year
Questions about observations performed in the radio frequency range of the electromagnetic spectrum.
298 questions
45 asked this year
Questions regarding the amount of space between two objects, the units, or measurement thereof.
286 questions
33 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…
254 questions
35 asked this year
Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.
239 questions
34 asked this year
Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.
234 questions
21 asked this year
Analysis of data is a process of inspecting, cleaning, transforming, and modeling data with the goal of discovering useful information, suggesting conclusions, and supporting decision making.
228 questions
55 asked this year
Questions regarding the history of astronomy, including discoveries and scientists.
223 questions
30 asked this year
Questions regarding the action of or an object rotating along an axis.
221 questions
31 asked this year
Questions regarding Mars, the fourth planet from the Sun.
220 questions
23 asked this year
Questions regarding stars which increase suddenly in energy output due to an explosion which ejected much of its mass.
219 questions
25 asked this year
Questions about relativistic theory of gravity. General relativity describes gravity as a geometrical property of space and time.
215 questions
39 asked this year
Questions about the measurement of light waves whereby the wavelength is classified by its position in the electromagnetic spectrum.
215 questions
40 asked this year
Questions regarding Jupiter, the 5th and largest planet in the Solar System.
213 questions
20 asked this year
Questions on celestial bodies that orbit planets.
196 questions
16 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…
195 questions
21 asked this year
Questions regarding the 4-dimensional background structure of our universe.
191 questions
5 asked this year
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