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physical object > natural object > celestial body > nebula > H II region > gaseous nebula > expanding emission nebula > planetary nebula > NGC 6818

NGC 6818
subject			fact

NGC 6818	is part of Sagittarius
	has distance 6000 light years
	has image
	has extent 0.5 light years
	is an instance of planetary nebula
planetary nebula	has expansion velocity typically 10 km/s
	has catalog planetary nebula catalog
expanding emission nebula	has composition enhanced with heavy elements relative to the interstellar medium
	has explosion date
	has progenitor star
gaseous nebula	has synonym emission nebula
nebula	is a part of gas
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 material

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