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open cluster
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open cluster

Loose cluster of young stars. More than 1,200 open clusters have been catalogued, each containing between a dozen and several thousand stars. They are also known as galactic clusters because of their abundance along the galactic plane. Examples include the Pleiades and the Hyades. Star clusters are of interest to astronomers because they represent samples of stars that have been formed at the same time from similar material. See also globular cluster and star cluster.
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Open clusters such as NGC 4755 typically contain anything from a few to thousands of stars that are loosely bound together by gravity.
'Cosmic jewel box' captured in all its glory by three telescopes by Asian News International
The beauty of open clusters lies in the many impressions and ways of describing the different sizes of these star groups.
Circinus a handy tool by Streicher, Magda / Monthly Notes of the Astronomical Society of Southern Africa
Binoculars show some of the individual stars making up the looser open clusters M23 and M25.
Spacewatch by guardian.co.uk / guardian.co.uk
 
 
 
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