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physical object > natural object > celestial body > collection of stars > galaxy > infrared galaxy

infrared galaxy
subject			fact

infrared galaxy	is a kind of galaxy
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

Kinds of infrared galaxy :

• extremely red galaxy (2 facts) (ERG)
• IRAS galaxy (3 facts) - Any galaxy which was discovered by the Infra-Red Astronomical Satellite (IRAS) to possess an excessive amount of infrared emission.
• ultra-luminous infrared galaxy (2 facts) (ULIRG)