Nasa’s big space observatories, Chandra (CXO), GALEX, Hubble (HST), and Spitzer (SST) have been used to obtain a new, gorgeous composite image in multiple parts of the spectrum: The X-ray, UV, optical, and infrared part, respectively.
Credit: X-ray: NASA/CXC/Wesleyan Univ./R.Kilgard et al; UV: NASA/JPL-Caltech; Optical: NASA/ESA/S. Beckwith & Hubble Heritage Team (STScI/AURA); IR: NASA/JPL-Caltech/ Univ. of AZ/R. Kennicutt
Chandra Press Release:
http://chandra.harvard.edu/photo/2007/m51/
Spitzer Press Release:
http://sscws1.ipac.caltech.edu/Imagegallery/image.php?image_name=sig07-024
SEDS M51 page:
http://www.seds.org/messier/m/m051.html
Messier 
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