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physical object > natural object > celestial body > collection of stars > collection of galaxies > galaxy cluster > galaxy group > loose group > M 81 group

M 81 group
subject			fact

M 81 group	is a part of Local Supercluster
	is an instance of loose group
loose group	has number of galaxies 10 to 100
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