W.A. Ward’s quote ‘curiosity is the wick in the candle of learning’ best defines man’s urge to know his surroundings and universe better. Ever since the field of science has evolved, scientists and astronomers have constantly struggled to understand the universe better. Over the centuries, many theories and calculations have resulted in a geocentric view of the space. From believing Milky Way as the only galaxy present in the universe to coming to terms with the presence of more than billion galaxies, the understanding of the universe has only bettered with time, thanks to the famous astronomers who dedicated their life to the study of cosmos. Every country has had a long list of astronomers who have significantly contributed through their discoveries and findings. Talking about American astronomers, they have greatly contributed right from the early days of astronomy to the modern era. Some of them include William K Hartmann, Edwin Hubble, Carl Sagan, Harlow Shapley, James Bauer, Frank Drake, Walter Sydney Adams and so on. Their findings and discoveries have helped educate people about the universe they live in. Update yourself by discovering interesting facts about the life and works of famous American astronomers.