Light is affected by different conditions.

Conditions that cause it to be reflected, deflected, refracted or absorbed.

The atmosphere being made up of many different gases and particles affects the way we see light. The earth’s atmosphere for the most part lets light rays pass through it’s orbital atmosphere uninterrupted, however a little of the red, orange and yellow is affected by air as light passes through the thinner layers of the earth’s atmosphere.

Why is the sky blue? The sky appears blue due to the affect of some light passing through the thin air atmosphere of the earth and the colors mentioned above (red, orange and yellow) affecting some of the light passing through, and therefore reflecting blue color for most of the earth to see.

At the edges of the horizen the sky appears much more pale in color due to the distance that part of the earth has to travel to reach your eyes. You are seeing less of the effect.

Me - I just thought the sky was blue because it was much prettier that way……………..