Stellar radiation refers to the electromagnetic radiation emitted by stars, including visible light, ultraviolet light, and infrared radiation. This radiation is produced through nuclear fusion reactions at the core of the star, which convert hydrogen into helium and generate energy in the form of electromagnetic radiation. By studying stellar radiation, researchers can learn more about the composition, temperature, and evolution of stars, as well as the processes that govern their formation and lifespan. This research area is crucial for understanding the properties of stars and their impact on the surrounding environment, such as planets and other celestial bodies.