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

Helix nebula (NGC 7293)
subject			fact

Helix nebula	is part of Aquarius
	has distance 450 light years
	has synonym NGC 7293
	has image
	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
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 extent
	has material

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