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physical object > natural object > celestial body > collection of stars > galaxy > spiral galaxy > Sb spiral > M 81

M 81 (NGC 3031)
subject			fact

M 81	has Messier number 81
	has synonym NGC 3031
	has discovery date 1774
	has discoverer Johan Elert Bode
	is a part of Ursa Major
	is a part of Local Group
	has image
	has definition A giant spiral galaxy 11 million light-years away in the constellation Ursa Major. It rules the M81 group, the second nearest galaxy group to the Local Group.
	is an instance of Sb spiral
	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
spiral galaxy	has classification criterion Subdivided according to the openness of the spiral arms as Sa spiral, Sb spiral or Sc spiral.
	has mass 1010 to 1012 Msun
galaxy	has number of stars 106 to 1012
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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