is a gravitationally-bound group of up to a thousand stars that formed together in the same molecular cloud.
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http://en.wikipedia.org/wiki/Glossary_of_astronomy
An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist. They are loosely bound to each other by mutual gravitationa...
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http://en.wikipedia.org/wiki/Open_cluster
Collection of stars?such as the Pleiades?forming a fairly compact mass outside the Milky Way.
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http://jot101.com/2015/05/a-z-of-science-fiction-words/
System containing a few dozen to a few thousand stars that formed from the same stellar nursery.
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http://planetfacts.org/space-terms/
in astronomy, any group of young stars held together by mutual gravitation. See star cluster.[5 related articles]
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http://www.britannica.com/eb/a-z/o/22
The open cluster M39 in Cygnus. It lies about 800 light-years away and contains stars that are only about 300 million years old. Image: WIYN telescope, Kitt Peak A loose aggregation of dozens or hundreds of young stars, in a volume of space typically less than 50 light-years across. Open clusters...
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http://www.daviddarling.info/encyclopedia/O/opencluster.html
A loose association of stars with no clearly defined shape. Often referred to as 'Galactic Clusters' since they are all found close to the galactic plane (of our galaxy). There are a little over 1000 of these clusters and they may contain just a dozen stars or as many as 500. The clusters occupy a region of space of only a few tens of light years a...
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http://www.encyclo.co.uk/local/20448
A collection of young stars that formed together. They may or may not be still bound by gravity. Some of the youngest open clusters are still embedded in the gas and dust from which they formed.
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http://www.seasky.org/astronomy/astronomy-glossary.html
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.
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https://www.infoplease.com/dictionary/open-cluster
No exact match found.
