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Last updated on April 17, 2014 at 1:21 EDT
M51 Herschel image at 160 100 and 70 microns
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M51 Herschel image at 160, 100 and 70 microns

June 23, 2009
Far-infrared image of M 51, the ‘whirlpool galaxy' at three different wavelengths (160, 100 and 70 microns) , taken by the Herschel Photoconductor Array Camera and Spectrometer, PACS.

These images clearly demonstrate that the shorter the wavelength, the sharper the image — this is a very important message about the quality of Herschel's optics, since PACS observes at Herschel's shortest wavelengths.