Planck's Law describes how objects emit radiation based on their temperature. It states that hotter objects emit more radiation at shorter wavelengths, meaning they glow brighter and bluer. This law is fundamental in understanding how stars, including our Sun, and other celestial bodies radiate energy. The law is mathematically expressed through a formula that combines Planck's constant, temperature, and wavelength. It helps explain phenomena like the color of heated metals and the cosmic background radiation from the Big Bang. Overall, Planck's Law is crucial for fields like astrophysics and thermodynamics.