Herschel's Law states that the intensity of light emitted by a black body is proportional to the fourth power of its absolute temperature. This means that as the temperature of an object increases, it emits significantly more light. The law is named after William Herschel, an astronomer who discovered infrared radiation while studying sunlight. This principle is crucial in understanding how stars and other celestial bodies emit energy. It helps scientists calculate the temperatures of stars based on their brightness. Herschel's Law is foundational in fields like astrophysics and thermodynamics, linking temperature and radiation in a clear mathematical relationship.