Édouard Stephan was a French astronomer born on March 10, 1837, in Paris. He is best known for his work in the field of astrophysics and for discovering several nebulae, including the famous Stephan's Quintet, a group of five galaxies located in the constellation Pegasus. His contributions significantly advanced the understanding of celestial objects. Stephan was also involved in the development of astronomical instruments and served as the director of the Marseille Observatory. His research and discoveries have had a lasting impact on the study of galaxies and the structure of the universe, making him a notable figure in the history of astronomy.