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 branch of astronomy that studies the regularities in the motions of stars in gravitational fields of stellar systems, as well as the evolution of stellar systems.
For questions about objects or phenomena outside Earth, generally on other planets.
Questions regarding the material at or near the center of an astronomical object.
Questions regarding grouping objects together based on one or more shared property.
Questions about the outermost layer of a body.
Questions regarding a phenomenon when an object has an orbital period that is equal to its rotational period due to gravitational tidal forces.
Questions about the Hubble constant, the constant factor of the rate of expansion in the universe
Questions about the chemical reactions that occur in the interstellar medium.
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…
Questions about the circumstellar disk orbiting in the outer Solar System, beyond the orbit of Neptune.
Questions regarding the large "cloud" of small bodies that forms a sphere around the solar system.
Questions about orbits with high eccentricities, which deviate greatly from perfect circles.
Questions related to earth processes or related processes and principles.
Questions about the simplest and most abundant element in the Universe.
Questions relating to the discovery of a new ninth planet (not Pluto) hypothesized in the Solar System.
Questions about the space observatory GAIA.
a general map or image of a region of the sky which lacks a specific observational target, but this tag also applies to surveys of a given class of objects, (e.g. TESS)
Questions regarding the future and ultimate fate of the Universe, including the heat death, Big Freeze, Big Rip, or Big Crunch.
Questions about red giants, large luminous low-mass stars in a late phase of stellar evolution.
Questions regarding matter in its gaseous state, and how it behaves in astronomy (e.g. forming stars in giant molecular clouds).
a planet that has a compact rocky surface like the Earth's; the four innermost planets in the solar system.
Questions regarding the space or objects outside of galaxies.
Questions regarding a sudden brightness increase due to the release of magnetic energy from the sun.
Questions on any of the 5 locations where a small object can maintain a stable orbital configuration with respect to two co-orbiting larger bodies.
Questions regarding undesired brightening of the night sky inhibiting observation of astronomical objects.
Questions to do with how new atomic nuclei are created inside the universe.
Questions regarding a manmade object sent to explore space and celestial objects.