This far-infrared image of M31, the Andromeda galaxy, was taken by the Herschel Space Observatory on Feb. 6, 2013. Star-forming regions of gas with temperatures barely above absolute zero are shown in orange, while slightly warmer, older stars in the central bulge are shown in blue.

ESA/PACS & SPIRE Consortium, O. Krause, HSC, H. Linz.