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02167_Field_galaxy cluster.txt
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1995-11-04
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509b
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galaxy cluster: An accumulation of
galaxies that are gravitationally
bound to each other. Galaxy clusters
vary in population from small (20
members) to immense (10,000+
members). Our galaxy, the Milky
Way, belongs to a small cluster
known as the Local Group.
Galaxy clusters are both regular and
irregular. Irregular clusters are not
spherically symmetric and contain a
mixture of all types of galaxies.
Regular clusters tend to be
spherically shaped and are dominated
by elliptical galaxies.