M78 is a section of the cloud just above Orion’s Belt. This image is a combination of 2 views: one in visible light from the Digitized Sky Survey, and the other from the APEX telescope, which can see light in the submillimeter wavelength range. Only cold/cold objects emit at this wavelength - a few degrees above absolute zero. The cold dust is falsely colored and glows orange. The blue material is gas/dust which can be seen in visible light.