ESA Herschel space observatory image of Andromeda (M31) using both PACS and SPIRE instruments to observe at infrared wavelengths of 70 um (blue), 100 um (green) and 160 um and 250 um combined (red). The image spans approximately 1 x 3 degrees.
This image was featured as space science image of the week on 28 January 2013.