universetoday.com
Spitzer's Stunning Portrait of Andromeda - Universe Today
NASA's Spitzer Space Telescope took this amazing photograph of our neighbour galaxy, Andromeda. The image was made by stitching together 11,000 separate images of the galaxy taken over the course of 18 hours of observations by Spitzer. Under Spitzer's infrared gaze, Andromeda reveals an off centre ring of star formation and a spot where it looks like another galaxy punched a hole as it passed through the galactic plane.