Astrophysical spectroscopy is a branch of astronomy that involves the study of the electromagnetic spectrum emitted by celestial objects such as stars, galaxies, and nebulae. By analyzing the unique patterns of light emitted or absorbed by these objects, astronomers can gain insights into their composition, temperature, mass, and other important properties. Spectroscopy allows astronomers to determine the chemical makeup of stars and galaxies, measure their distances from Earth, study the effects of gravity and magnetic fields on celestial objects, and even detect the presence of planets orbiting other stars. In short, astrophysical spectroscopy provides a powerful tool for astronomers to unravel the mysteries of the universe and expand our understanding of the cosmos.