✨Williamina Paton Stevens Fleming was an American astronomer. She was a single mother, hired by the director of the Harvard College Observatory to help in the photographic classification of stellar spectra. She helped develop a common designation system for stars and cataloged more than ten thousand stars, 59 gaseous nebulae, over 310 variable stars, and 10 novae and other astronomical phenomena. ⁠ ⁠ Among several career achievements that advanced astronomy, Fleming is noted for her discovery of the Horsehead Nebula in 1888.⁠ ⁠ ⁠ ⁠ #astronomer #williaminafleming #harvardcollege #nebulae #nebula #physics #science