Optical astronomy is a branch of astronomy that focuses on studying celestial objects and phenomena using visible light. This includes the observation of stars, planets, galaxies, and other celestial bodies through telescopes and other optical instruments. Optical astronomy has played a crucial role in advancing our understanding of the universe and has led to many important discoveries in the field of astronomy. By analyzing the light emitted or reflected by objects in space, optical astronomers can gather valuable data about their composition, temperature, distance, and motion, among other properties.