Around 2015, astronomers took on the painstaking task of stitching together Hubble Space Telescope images of this galaxy, but that effort had focused on the galaxy's northern half. Still, however, the resulting image showcased a sweeping view of 100 million stars packed into about 1.5 billion pixels.

The stunning panorama features over 600 overlapping Hubble images that have been painstaking stitched together. Spread across 2.5 billion pixels, you'll find some 200 million stars

Hubble Space Telescope mapped Andromeda, revealing a chaotic history shaped by mergers. A 2.5-billion-pixel mosaic shows 200 million stars.