The sky is blue because of a phenomenon called Rayleigh scattering. This scattering refers to the scattering of light by particles that are much smaller than the wavelength of light. Sunlight is scattered by the tiny molecules of air in Earth’s atmosphere. Blue light is scattered more than the other colors because it has a shorter wavelength. This is why we see a blue sky most of the time.

The amount of scattering is inversely proportional to the fourth power of the wavelength of light. This means that blue light, which has a shorter wavelength than red light, is scattered more strongly. This is why the sky appears blue on a clear day.

When the sun is low in the sky, its light has to travel through more of the atmosphere to reach our eyes. This means that more of the blue light is scattered away, and more of the red light reaches our eyes. This is why sunsets and sunrises often appear red.

The sky can also appear different colors due to other factors, such as pollution or clouds. Pollution particles can scatter light in different ways, which can change the color of the sky. Clouds are made up of water droplets, which can also scatter light. The size and shape of the water droplets can affect the color of the sky.

The sky is a beautiful and ever-changing canvas. The next time you look up at the sky, take a moment to appreciate the science behind its beauty.