Question

What Is the True Color of the Sky?

Answer 1

The sunlight reaching our eyes has a high ratio of short, bluish wavelengths compared to medium and long wavelengths, so we perceive the sky as being blue. Without an atmosphere the skyappears black, as evidenced by the lunar sky in pictures taken from the moon.

Answer 2

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Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.