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

loose group
subject			fact

loose group	has number of galaxies 10 to 100
	has definition Galaxy group with on the order of 10 galaxies separated by 10-100 galaxy diameters.
	is a kind of galaxy group
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 loose group :

• Local Group (11 facts) - The gravitationally bound collection of nearby galaxies ruled by the Andromeda galaxy and the Milky Way, which are its largest members. The Local Group has about 30 known galaxies., The association of galaxies to which the Milky Way galaxy belongs., A conglomeration of about twenty galaxies including our own Milky Way., The cluster of galaxies to which our Galaxy belongs. It is a poor, irregular cluster with some 20 certain members: three spirals (the Galaxy, M31, and M33); four irregulars (LMC, SMC, IC 1613, and NGC 6822); and about 13 intermediate or dwarf ellipticals (NGC 147; NGC 185; NGC 205; M32; the Sculptor, Fornax, Leo I and II, UMi, and Draco systems; and three companions to M31 discovered by van den Bergh in 1972). It may also include several other dwarf galaxies as well as the giant elliptical Maffei 1. The total mass of the Local Group is less than 1.5 times the combined masses of the Galaxy and M31., The system of galaxies to which our Milky Way galaxy belongs is a small group, containing only two large spirals (our galaxy and the Andromeda galaxy, Messier 31) and twenty or more smaller systems., The cluster of galaxies of which our own, the Milky Way, is one. Its radius is estimated at 10⁶ parsecs. Largest of the Group is the Andromeda galaxy.
• M 81 group (2 facts)