The big Hunter in the sky is seen in a new light by Planck, a European Space Agency mission with significant NASA participation. The long-wavelength image shows most of the constellation Orion, highlighting turbid clouds of cold material.
This image of the microwave sky was synthesized using data spanning the range of light frequencies detected by ESA's Planck. A vast portion of the sky is dominated by the diffuse emission from gas and dust in our Milky Way galaxy.