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

galaxy group
subject			fact

galaxy group	has number of galaxies < 100
	has definition A small gathering of galaxies, smaller than a cluster. The Milky Way is part of the Local Group, which contains about thirty galaxies.
	is a kind 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

Kinds of galaxy group :

• compact group (3 kinds, 14 facts) - Galaxy group with a few galaxies separated by a few galaxy diameters.
• loose group (2 kinds, 16 facts) - Galaxy group with on the order of 10 galaxies separated by 10-100 galaxy diameters.