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physical object > natural object > celestial body > Messier object > Ring Nebula

Ring Nebula (M 57)
subject			fact

Ring Nebula	has illuminating star
	is a part of Lyra
	has Messier number 57
	has progenitor star
	has distance 2000 light years
	has synonym M 57
	has image
	has definition A famous planetary nebula (M57, NGC 6720) in the constellation Lyra.
	is an instance of planetary nebula
	is an instance of Messier object
	is an instance of Messier object
Messier object	has apparent dimension
	has apparent magnitude
	is a part of celestial sphere
	has catalog Messier catalog
	has purpose originally to catalog all objects which could be confused with a comet
planetary nebula	has expansion velocity typically 10 km/s
	has catalog planetary nebula catalog
celestial body	has spectra
expanding emission nebula	has composition enhanced with heavy elements relative to the interstellar medium
	has explosion date
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
nebula	is a part of gas

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