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physical object > natural object > celestial body > collection of stars > star cluster > globular cluster > class IX globular cluster > M 4

M 4 (NGC 6121)
subject			fact

M 4	is a part of Scorpius
	is a part of halo
	has Messier number 4
	has reference NED, SIMBAD
	has synonym NGC 6121
	has discovery date 1746
	has discoverer Philippe Loys de Cheseaux
	has image
	is an instance of class IX globular cluster
	is an instance of Messier object
Messier object	has apparent dimension
	has apparent magnitude
	is a part of celestial sphere
	has distance from Earth
	has catalog Messier catalog
	has purpose originally to catalog all objects which could be confused with a comet
celestial body	has spectra
globular cluster	has diameter about 100 light-years
	has orbit elongated, around the galactic center
	is a part of halo
	has age oldest stellar formation in the Galaxy
	has number of stars 105 to 106
	has spectra low abundances of heavy elements
	has velocity very high
	has mass 104 to 106 Msun
	has location most are in the halo some are members of the thick disk
physical object	has angular momentum
	has momentum
	has temperature
	has volume
	has extent
	has material

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