Answer:
We see a blue sky, because of the way the atmosphere interacts with sunlight.
Explanation:
White light, including sunlight, is made up of many different colors of light, each with its own corresponding wavelength.
Several different things can happen when this light encounters matter.
For instance, if sunlight passes through a transparent material, such as water, those light waves will refract, or bend, because light changes speed as it travels from one medium (air) to another (water). Prisms break up white light into its constituent colors, because different wavelengths of light refract at different angles — the colors travel at different speeds — as they pass through the prism.
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Though the atmospheric particles scatter violet more than blue (450-nm light), the sky appears blue, because our eyes are more sensitive to blue light and because some of the violet light is absorbed in the upper atmosphere.
During sunrise or sunset, the sun's light has to pass through more of the atmosphere to reach your eyes. Even more of the blue and violet light gets scattered, allowing the reds and yellows to shine through.
