Andromeda Galaxy (M31), 29 December 1888.

UNITED KINGDOM : Photograph of the Great Nebula (galaxy) in Andromeda, taken 29 December 1888 by Issac Roberts (1829-1904), an acclaimed early pioneer of astrophotography. A successful building contractor and amateur astronomer, this image was made using Robert's twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. From his observatory at his home in Maghull, near Liverpool, he systematically photographed the brightest nebulae and star clusters visible from England. This high-resolution photograph is the first to show the spiral nature of the Andromeda Nebula, which we now know to be a galaxy, a vast island of stars at great distance from our own galaxy the Milky Way. (Photo by SSPL/Getty Images)