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open cluster
(redirected from Galactic Clusters)

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open cluster, see star cluster star cluster, a group of stars near each other in space and resembling each other in certain characteristics that suggest a common origin for the group. Stars in the same cluster move at the same rate and in the same direction.
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open cluster

 or galactic cluster

Any group of Population I (see Populations I and II) stars with a common origin, held together by mutual gravitation (not to be confused with a cluster of galaxies). Stars in open clusters are much more scattered than those in globular clusters. All known open clusters contain from about 10 to 1,000 or more stars (about half contain fewer than 100) and have diameters of 5–75 light-years. More than 1,000 have been discovered in the Milky Way Galaxy; well-known examples include the Pleiades and the Hyades.

open cluster [′ō·pən ′kləs·tər]
(astronomy)
One of the groupings of stars that are concentrated along the central plane of the Milky Way; most have an asymmetrical appearance and are loosely assembled, and the stars are concentrated in their central region; they may contain from a dozen to many hundreds of stars. Also known as galactic cluster.
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Only in the past 10 years have other observations, in fact, revealed that the thin gas permeating massive galactic clusters is heated to tens of millions of degrees.
Ultra massive: as big as it gets: a black hole can consume anything ... by Petit, Charles / Science News
USA: Astronomers have captured images of the oldest and most distant galactic clusters ever seen - a discovery that shows immense numbers of stars formed less than two billion years after the birth of the cosmos.
The World today by The Journal (Newcastle, England)
ASTRONOMERS have captured images of the oldest and most distant galactic clusters ever seen - a discovery that shows immense numbers of stars formed less than two billion years after the birth of the cosmos.
A star-studded view of the galaxy by Coventry Evening Telegraph (England)
 
 
 
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