Herschel survey in visible light
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Herschel survey in visible light

March 20, 2014
Collage of galaxies included in the Herschel Reference Survey as seen at visible wavelengths in images obtained by the Sloan Digital Sky Survey. The colour distribution highlights different stellar ages, with red and blue indicating older and younger stars, respectively. Copyright Sloan Digital Sky Survey/L. Cortese (Swinburne University)

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