why is the sky blue

The sky is blue because of the way sunlight interacts with the atmosphere. Sunlight is composed of all the colors of the rainbow, and when it enters the atmosphere, it gets scattered in all directions by air molecules. Because blue light is scattered more than the other colors, it is what we see when we look up in the sky. The atmospheric scattering of blue light is known as Rayleigh scattering. This phenomenon occurs when blue light's shorter wavelength interacts with the air molecules, causing it to scatter in different directions and fill the sky with a blue hue. The intensity of the blue color we see in the sky depends on the amount of dust and particles in the atmosphere, which is why sunsets often appear more red or orange.