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physical object > natural object > celestial body > collection of stars > galaxy > emission line galaxy > narrow emission line X-ray galaxy

narrow emission line X-ray galaxy (NLXG)
subject			fact

narrow emission line X-ray galaxy	has acronym NLXG
	is a kind of emission line galaxy
emission line galaxy	has emission lines
galaxy	has number of stars 106 to 1012
	has catalog galaxy catalog
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