Energy and Earth Science Science

Why Is the Sky Blue?

Sunlight is dispersed in all directions by gases and particles in the atmosphere. Blue light is dispersed across the many colors because of the shorter, smaller waves it travels through. That’s why most of the time we see a blue sky. You probably questioned, “Why the sky is blue, as most curious people?” Or you may have questioned, “Why is the skies red?” if you saw a stunning sunset or sunrise? You may think the reasons are just as simple. It’s so clear that the sky is blue. They’re not! Why blue of all the rainbow colors? ¬†heaven be green just as easily? Or yellow? If we see a rainbow, we see green and yellow in the sky and everything of that between is blue, purple, orange, yellow, red. The white light from the Sun consists of all of the rainbow’s colors. When we look at rainbows, we see all these shades.

Raindrops function as little prisms when they are hit by the Sunlight, bending and dividing light into distinct colors. Then why are there different colors available? The light you see is a little piece of all the light energy around and around the universe! Light energy moves in the waves like energy pass through the ocean too. It’s a wavelength or range of wavelengths that make one type of light different from another. The wavelengths that our eyes can see include visible light. We can see the longest wavelengths of red. We can see blue or purple at the shortest wavelengths.

In this photo, the wavelengths must not be measured. A red light wave of around 750 nanometers, a blue or violet wave of approximately 400 nanometers. One milliard of a meter is a nanometer. A human hair is approximately 50,000 nanometres! Those observable wavelengths of light are very, very small. Another significant thing about light is that it goes straight ahead unless something stops it.

  • Reflect this (like a mirror)
  • Bend it or scatter it (like a prism) (like molecules of the gases in the atmosphere)

When the white light from the sun comes into the Earth’s atmosphere, many of our eyes pass through the atmosphere directly through the green, yellow, and red wavelengths of light (mixed and nearly white). However, the blue and violet wavelengths are the proper length for the molecules of gas to hit and bounce off the atmosphere. The blue and violet waves are therefore split from the remaining light and dispersed in all directions to be seen in all directions. The other wavelengths remain white and stick together as a group.

What’s happening with all the wavelengths “non-blue?” Still mixed, dispersed with the environment, they still look white. The violet and blue light overlook the sky to make it look blue. What’s the violet going on? The upper atmosphere absorbs part of the violet light. Furthermore, our eyes are not as violet-sensitive as blue.

The sky fades into a lighter blue or white, nearer to the horizon. From the horizon, the sunshine has gone even more through than the sunlight from above. The gas molecules have so often dispersed blue light that less blue light reaches humans.

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