Luminous infrared galaxy
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Luminous Infrared Galaxies or (LIRG's) are galaxies with luminosities, the measurement of brightness, above 10 L☉. LIRG's are more abundant than starburst galaxies, Seyfert galaxies and quasi-stellar objects at comparable luminosity. Infrared galaxies emit more energy in the infrared than at all other wavelengths combined. A LIRG's luminosity is 100 billion times that of our sun.