Three images of M 51 in SDSS photometric bands: u (UV, 354 nm), g (optical, 623 nm) and IR (z, 913 nm) bands. Images reduced to the same scale and brightness for the convenient comparison
<a href="//commons.wikimedia.org/wiki/User:Vallastro" title="User:Vallastro">Vallastro</a>
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<span class="int-own-work" lang="en">Own work</span>