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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > Hercules cluster

Hercules cluster (3U 1551 + 15)
subject			fact

Hercules cluster	is a part of Hercules
	is a part of Local Supercluster
	has redshift z = 0.036
	has number of galaxies 75
	has synonym 3U 1551 + 15
	has definition An 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.
	is an instance of galaxy cluster
collection of stars	has number of stars
	has catalog catalog about star systems
celestial body	has spectra
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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