Here's an expanded explanation of why the sky appears blue, with more details and interesting facts: The sky's blue color is a fascinating phenomenon that has captivated humans for centuries. The answer lies in the interaction between light, air molecules, and our atmosphere. Let's dive deeper into the science behind this breathtaking sight. *Rayleigh Scattering: The Key to the Sky's Blue Color* In the late 19th century, Lord Rayleigh discovered that shorter wavelengths of light are scattered more than longer wavelengths by small molecules of gases in the atmosphere. This phenomenon, known as Rayleigh scattering, is responsible for the sky's blue appearance. Here's a step-by-step explanation: 1. *Sunlight enters the atmosphere* : When the sun's rays enter Earth's atmosphere, they contain all the colors of the visible spectrum, including red, orange, yellow, green, blue, indigo, and violet. 2. *Encountering air molecules*: As sunlight travels through the