The sky appears blue due to a phenomenon called Rayleigh scattering. When sunlight enters the Earth’s atmosphere, it collides with molecules and small particles in the air. Sunlight is made up of many colors, each with different wavelengths. Blue light has a shorter wavelength compared to other colors like red or yellow. Because of this shorter wavelength, blue light is scattered more effectively in all directions by the air molecules. As a result, when we look up at the sky, we see it as blue. During sunrise and sunset, the light has to pass through more of the atmosphere, scattering the blue light even more and allowing the reds and oranges to dominate, giving us those beautiful colors.
By supportberkshire.uk 
The sky appears blue due to a phenomenon called Rayleigh scattering. When sunlight enters the Earth’s atmosphere, it collides with molecules and small particles in the air. Sunlight is made up of many colors, each with different wavelengths. Blue light has a shorter wavelength compared to other colors like red or yellow. Because of this shorter wavelength, blue light is scattered more effectively in all directions by the air molecules. As a result, when we look up at the sky, we see it as blue. During sunrise and sunset, the light has to pass through more of the atmosphere, scattering the blue light even more and allowing the reds and oranges to dominate, giving us those beautiful colors.