The disk of the Andromeda Galaxy, M31, which spans more than 3 degrees, is targeted by a single DESI pointing, represented by the large, pale green, circular overlay. The smaller circles within this overlay represent the regions accessible to each of the 5,000 DESI robotic fiber positioners. In this sample, the 5,000 spectra that were simultaneously collected by DESI include not only stars within the Andromeda Galaxy, but also distant galaxies and quasars. The example DESI spectrum that overlays this image is of a distant quasar, QSO, 11-billion years old. Image: DESI collaboration and DESI Legacy Imaging Surveys