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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > Hercules cluster
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Hercules cluster comparison table
Subject has number of galaxie is part of is a kind of has redshift is an instance of has synonym has definition
galaxy cluster102 to 103 (order of magnitude) collection of galaxies   An aggregate of galaxies. Bautz and Morgan divide them into three morphological types: type I contains a supergiant cD galaxy; Coma is type II, type III contains no members significantly brighter than the general bright population. Virgo is type III. 21 known X-ray sources are associated with clusters of galaxies.
Hercules cluster75Local Supercluster z = 0.036galaxy cluster3U 1551 + 15An unsymmetrical cluster. Half of the galaxies are spiral or irregular and about half elliptical or S0. It contains a rather large number of disturbed and peculiar galaxies. The "missing mass", if present, must constitute more than 95% of the total.

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