Why is the sky blue? This seemingly simple question opens a window into the fascinating world of light and its interaction with our atmosphere. The phenomenon responsible is called Rayleigh scattering, named after the British scientist Lord Rayleigh. Sunlight may appear white, but it is actually a mix of colors—red, orange, yellow, green, blue, indigo, and violet. Each of these colors corresponds to a different wavelength of light. When sunlight enters Earth's atmosphere, it encounters air mo...