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physical object > natural object > celestial body > nebula > H II region > gaseous nebula > expanding emission nebula > nova remnant

nova remnant
subject			fact

nova remnant	has lifetime a few centuries
	can be used to measure distance
	has expansion velocity typically 1000 km/s
	has mass much lower than planetary nebula
	has definition an expanding emission nebula produced by a nova
	is a kind of expanding emission nebula
expanding emission nebula	has composition enhanced with heavy elements relative to the interstellar medium
	has explosion date
	has progenitor star
gaseous nebula	has catalog gaseous nebula catalog
	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 velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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