The sky is blue because of how sunlight interacts with the atmosphere. Sunlight is made of many colors, each with a different wavelength. When sunlight enters the atmosphere, it hits air molecules and tiny particles, scattering in all directions. This scattering is called Rayleigh scattering, and it is more effective for shorter wavelengths of light, like blue and violet. While violet light is scattered even more than blue, our eyes are more sensitive to blue and less to violet. Additionally, some violet light is absorbed in the upper atmosphere, making blue the dominant color we see. During sunrise and sunset, the sky can appear red or orange because the sunlight travels through more atmosphere. This scatters the blue light out of view, leaving the longer wavelengths like red and orange. The blue sky is a result of the natural behavior of light and the composition of Earth's atmosphere.