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Why is the sky blue?

Alex Williams
Last updated: 2022/04/25 at 6:53 PM
Alex Williams
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2 Min Read
  1. Sun rays are divided into many colors

    Sun rays contain many colors just like a rainbow, and they don’t consist of a single color. The reason we only see the color blue is related to how the color is reflected to us.

    Contents
    Sun rays are divided into many colorsMolecules in the atmosphere scatter lightBlue has a shorter wavelengthThe blue light hides starsThe sun is too bright to be hiddenBlue light gets scattered away at sunsetSun rays don’t contain much violet
  2. Molecules in the atmosphere scatter light

    The molecules and particles in Earth’s atmosphere scatter sunlight in all directions. What those molecules do to sunlight is similar to what a prism does to to a light ray, but what’s different is the concentration of blue light they reflect.

  3. Blue has a shorter wavelength

    Because blue light has a shorter wavelength than other colors, it gets scattered more by those particles and this is why we see a blue sky and not a red sky, for example.

  4. The blue light hides stars

    The blue light scattered in the sky hides most distant stars. This is why stars can’t usually be seen in the morning. (See What makes the moon look orange?)

  5. The sun is too bright to be hidden

    The reason the sun still appears while other stars don’t is that it’s too bright. Because the sun is very close to earth, it becomes visible in the morning while other stars don’t appear.

  6. Blue light gets scattered away at sunset

    By sunset the blue light will have scattered away and this is why the sunset appears to contain both red and orange colors. (See Why do people like watching sunsets?)

  7. Sun rays don’t contain much violet

    Violet has a shorter wavelength yet we don’t see a violet sky because sun-rays don’t have much violet, in addition to the fact that our vision is more sensitive to blue light than violet light.

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alex1
By Alex Williams
Alex Williams is a PhD student in urban studies and planning. He is broadly interested in the historical geographies of capital, the geopolitical economy of urbanization, environmental and imperial history, critical urban theory, and spatial dialectics.

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