Concept information
Terme préférentiel
Local Group
Définition(s)
- The Local Group is the galaxy group that includes the Milky Way. It has a total diameter of roughly 3 megaparsecs (10 million light-years; 9×10¹⁹ kilometres), and a total mass of the order of 2×10¹² solar masses (4×10⁴² kg). It consists of two collections of galaxies in a "dumbbell" shape: the Milky Way and its satellites form one lobe, and the Andromeda Galaxy and its satellites constitute the other. The two collections are separated by about 800 kiloparsecs (3 million light-years; 2×10¹⁹ kilometres) and are moving toward one another with a velocity of 123 km/s. The group itself is a part of the larger Virgo Supercluster, which may be a part of the Laniakea Supercluster. The exact number of galaxies in the Local Group is unknown as some are occluded by the Milky Way; however, at least 80 members are known, most of which are dwarf galaxies. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Local_Group)
Concept(s) générique(s)
Synonyme(s)
- local group of galaxies
Traductions
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français
-
amas local
-
groupe local de galaxies
URI
http://data.loterre.fr/ark:/67375/MDL-JBC3615X-J
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