WISE image of the Orion Nebula provided by the University of Berkeley. Blue represents emission at 3.4 μm, and cyan (blue-green) represents emission at 4.6 μm, both of which come mainly from hot stars. Relatively cooler objects, such as PAHs (i.e., the dust of the nebulae), appear green and red. Green and red represent 12 μm and 22 μm emission, respectively, which trace very small grains. The field of view of the original image is 3° × 3°, but we trimmed the image to only show the outflow beyond the protrusion. The original file can be retrieved at http://wise.ssl.berkeley.edu/gallery_OrionNebula.html.