- a comparatively young, irregularly shaped group of stars, often numbering up to several hundred, and held together by mutual gravitation; usually found along the central plane of the Milky Way and other galaxies.
* * *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.
* * *in astronomy, any group of young stars held together by mutual gravitation. See star cluster.
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Open cluster — Galactic cluster redirects here. See also galaxy groups and clusters NGC 265, an open star cluster in the Small Magellanic Cloud An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and… … Wikipedia
open cluster — noun : a cluster of stars in which all the individual members may be discerned with an optical aid and which is much less compact and has fewer members than a globular cluster; often : a galactic cluster … Useful english dictionary
open cluster — noun a more or less irregular star cluster containing tens to thousands of stars … Wiktionary
open cluster — /oʊpən ˈklʌstə/ (say ohpuhn klustuh) noun a group of stars having a common motion through space in which the stars are not densely packed (as in a globular cluster) but are interspersed with gas and dust clouds … Australian English dictionary
open cluster — noun Astronomy a loose grouping of stars … English new terms dictionary
Open Cluster Framework — (OCF) is a set of standards for computer clustering. The project started as a working group of the Free Standards Group, now part of the Linux Foundation. Original supporters included several computing companies and groups, including Compaq,… … Wikipedia
Open cluster remnant — In astronomy, an open cluster remnant (OCR) is the final stage in the evolution of an open star cluster. Contents 1 Theory 2 Observations 3 Simulations 4 References … Wikipedia
Open cluster family — In astronomy, an open cluster family is a group of approximately coeval (age range ∼30 Myr) young open star clusters located in a relatively small region of the Galactic disk (radius ∼250 pc). Introduction Open star clusters do not form in… … Wikipedia
cluster — clusteringly, adv. clustery, adj. /klus teuhr/, n. 1. a number of things of the same kind, growing or held together; a bunch: a cluster of grapes. 2. a group of things or persons close together: There was a cluster of tourists at the gate. 3. U.S … Universalium
Cluster — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sur les autres projets Wikimedia : « Cluster », sur le Wiktionnaire (dictionnaire universel) Sommaire … Wikipédia en Français