The Infrared Universe: Galaxies
Messier 81 (M81) is a classic example of a spiral galaxy. Star-forming regions in this galaxy become evident in the infrared view. In the infrared, the spiral arm structure becomes much more powerful relative to the visibly bright galactic center, revealing denser concentrations of cold dust and gas ready to be transformed into new stars.
CREDITS: Visible: N.A. Sharp (NOAO/AURA/NSF). Near-infrared: NASA/JPL-Caltech/S. Willner (Harvard-Smithsonian Center for Astrophysics). Far-infrared: NASA/JPL-Caltech/K. Gordon (University of Arizona) & S. Willner (Harvard-Smithsonian Center for Astrophysics).