Pan across the largest Hubble Space Telescope image ever assembled, a sweeping view of a portion of the Andromeda galaxy (M31). This is the sharpest composite image ever taken of the galaxy, which lies some 2.5 million light years from our own Milky Way. The Hubble Space Telescope is powerful enough to resolve individual stars in a 61, 000-light-year-long stretch of the galaxy's disk. There are more than 100 million stars in this view alone, some of them in thousands of star clusters seen embedded in the disk. The entire galaxy is estimated to contain some one trillion stars. To create the image, the HST took 411 individual images between 2010-2013, in near-ultraviolet, visible and near-infrared light, which were combined into this mosaic. The original frame size of this enormous image is 17384x5558 pixels.