Concept information
Preferred term
galaxy
Definition(s)
- A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias (γαλαξίας), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's center of mass. Most of the mass in a typical galaxy is in the form of dark matter, with only a few percent of that mass visible in the form of stars and nebulae. Supermassive black holes are a common feature at the centres of galaxies. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Galaxy)
Broader concept(s)
Narrower concept(s)
- active galaxy
- cluster member galaxy
- compact galaxy
- disk galaxy
- dwarf galaxy
- early-type galaxy
- elliptical galaxy
- galactic cluster
- galactic nucleus
- galactic pole
- Haro galaxy
- high surface-brightness galaxy
- infrared galaxy
- irregular galaxy
- late-type galaxy
- lenticular galaxy
- low surface-brightness galaxy
- merging galaxies
- merging galaxies remnant
- peculiar galaxy
- protogalaxy
- ring galaxy
- satellite galaxy
- Sculptor dwarf elliptical galaxy
- spiral galaxy
- starburst galaxy
In other languages
-
French
URI
http://data.loterre.fr/ark:/67375/MDL-XQ63631W-F
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