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open cluster
noun Astronomy.
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.
Also, galactic cluster.
Compare globular cluster, stellar association.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Open cluster
is always a great word to know.
So is dwarf star. Does it mean:
| a low-mass star that emits low to average amounts of light that burn their hydrogen slowly over a long life span |
| a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue |
Dictionary.com's 21st Century Lexicon
| Main Entry: | open cluster |
| Part of Speech: | n |
| Definition: | a loose grouping of stars |
| Usage: | astronomy |
American Heritage
Science Dictionary
| open cluster
A loose, irregular grouping of stars that originated from a single nebula in the arms of a spiral galaxy. Compared to globular clusters, open clusters generally contain younger and fewer (from a hundred to several thousand) stars and are confined to the disk of the galaxy. Because they are young, open clusters are sometimes still surrounded by the leftover gas and dust from which they formed. Visible from Earth with just a pair of binoculars and containing over 3,000 stars, the Pleiades is the best known open cluster. Also called galactic cluster. Compare globular cluster. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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