Let’s begin answering this question by getting the obvious stuff out of the way. Sunsets bring an orange hue too the sky, and darkness brings purple, dark blue, or black. Special Aurora lights give off a wide diversity of light. Now, it’s possible to assume that the sky’s color changes with different lights. We know that the sun is the only source of light in our solar system, so therefore the sun must be involved in the sky’s color.

     Light emitted by the sun is white (all light is white unless a colored bulb is placed over it). White color brightens other colors. Therefore, when the sun is high up (at noon), there is a maximum amount of light reaching Earth, which is why it’s so brightly colored.

     Based on this information, you would assume that the sky must be completely white, but it isn’t. Particles in the atmosphere block and distort some of the light, causing it to break up and separate into the lights in the visible spectrum. Therefore, all bright lights can be formed in the correct amount and type of materials in the atmosphere would be present.

     You also notice that the darker colors appear only when the sun sets, or when there is no sun visible (night time). This happens because of outer space. Space is pitch black due to the lack of light. When the darkness of space is added, all the colors in the sky turn darker until they are pitch black aswell, when the sun leaves completely.

     Think of the sky as a pallet of colors, with different pollutions affecting the color, and the sun or space affecting the hues.

     Some special cases, like the Aurora lights, produce bright colors even during the night. This happens because of bursts of heat from the sun clashing with Earth’s magnetic field. The distortions produce vivid lights that are truly a spectacular feat to watch if you ever happen to go to the north or south pole.