This is because sunlight is made up of various colors of light, and each color has a different tendency to scatter and bend. A rainbow is a good example of this. In a rainbow, sunlight is divided into seven colors (red, orange, yellow, green, blue, ai, and purple) by water molecules in the air. Using a prism or other light-splitting device, we can observe the splitting of light into different colors even in our own homes.

A closer examination reveals that light is a type of wave that travels from a source of light, such as the sun or an electric light, to its surroundings. The color of light is determined by the length (wavelength) of this wave from peak to peak. Red light has a longer wavelength, blue light a shorter wavelength, and so on.

Light with a short wavelength is easily scattered by molecules such as nitrogen and oxygen in the air and spreads from place to place. This phenomenon is called "scattering," and the shorter the wavelength, the more easily it scatters. In other words, blue light, which has a shorter wavelength, scatters more easily than red light, which has a longer wavelength, and this is why the sky appears blue.

Then, why does the sky, which appears blue during the day, appear red at sunrise and sunset? This has to do with the path of sunlight to the earth. In the morning and evening, the sun is low in the sky near the horizon, and sunlight travels a longer distance through the Earth's atmospheric layer to reach the ground. During this time, most of the blue light is scattered and lost, leaving more of the less-scattered red and orange light. This is why the sky appears red to our eyes.