Tags
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.
Questions about the techniques and practice of observing the night sky.
1480 questions
Questions regarding large spheres of plasma undergoing fusion.
1305 questions
Questions regarding the closest star to Earth, at the centre of the Solar System.
1002 questions
Questions regarding Earth's only natural satellite. For questions about the natural satellites of other planets, use the tag [natural-satellite].
880 questions
Questions regarding points of extremely high mass density, which creates an extremely strong gravitational field from which light cannot escape.
861 questions
Questions regarding an object 'falling around' another object, due to a combination of gravity and momentum.
841 questions
Questions regarding systems of large numbers of stars held together by gravity.
826 questions
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.
801 questions
Questions related to the physical instruments for astronomical observations.
728 questions
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.
720 questions
Questions regarding the attractive force which exists between any two bodies of matter.
656 questions
Questions regarding the planet on which humans live; the third planet from the Sun.
632 questions
Questions about the observation of celestial objects by non-professional astronomers.
626 questions
Questions about the origin, history, evolution and fate of the Universe.
580 questions
Questions regarding planets that lie outside the Solar System.
539 questions
Questions regarding all of time and space and its contents.
409 questions
The application of ballistics and celestial mechanics to the practical problems concerning the motion of rockets and other spacecraft.
404 questions
Questions regarding relatively small rocky bodies in an orbit around the Sun.
366 questions
Questions about observations performed in the radio frequency range of the electromagnetic spectrum.
364 questions
Questions regarding the amount of space between two objects, the units, or measurement thereof.
361 questions
Questions regarding electromagnetic radiation in the visible spectrum.
360 questions
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…
320 questions
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.
315 questions
Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.
309 questions
Questions regarding stars which increase suddenly in energy output due to an explosion which ejected much of its mass.
288 questions
Questions about relativistic theory of gravity. General relativity describes gravity as a geometrical property of space and time.
284 questions
Questions about the measurement of light waves whereby the wavelength is classified by its position in the electromagnetic spectrum.
279 questions
Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.
276 questions
Questions regarding the history of astronomy, including discoveries and scientists.
275 questions
Questions regarding Jupiter, the 5th and largest planet in the Solar System.
261 questions
Questions regarding the action of or an object rotating along an axis.
259 questions
Questions about the increase with time of distance between two distant points in the Universe.
256 questions
Questions on celestial bodies that orbit planets.
242 questions
Questions related to the phenomenon whereby electromagnetic radiation (such as visible light) generated by an object moving away from an observer will have increase in wavelength (i.e. shifted toward …
237 questions