Andromeda, catalogue number M31, is the nearest big galaxy to our own Milky Way. Its size, about 152,000 light years across, gives it the span of about six full Moons - except that it's very faint, so with the naked eye only the bright fuzzy centre is visible.

My picture comprises more than 2,600 x 20” exposures (14.5 hours) at ISO 800, imaged from Colchester, England, in November 2023 on a modified Nikon D750 DSLR with Baader MPCC III coma corrector, Sky-Watcher Explorer 150p on EQ5 Pro, via Stellarmate in Kstars/Ekos. Stacked in AstroPixelProcessor, cropped and adjusted in Photoshop and Lightroom.