Why Is The Sky Blue

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Why Is The Sky Blue?

The atmosphere is a mixture of gas molecules and other materials surrounding earth. Its made mostly of gases nitrogen (78%), and oxygen (21%). Argon gas and water (in the form of vapor, droplets and ice crystals). They are second most common things. There small amounts of other gases, and many tiny solid particles, like dust, soot and ashes, pollen, and sea-salt from oceans.

Sunlight is made of every color of the colorful rainbow: red, orange, yellow, green, blue, and violet. The gas molecules in atmospheres come between the sunlight before its rays of light reaches our eyes.

The gas molecules in atmospheres scatter the higher-energy (high frequency) blue portion of the sunlight more than they scatter the lower-energy red portion of the sunlight (this is called Rayleigh scattering, name for the physicist Lord John Rayleigh). The Sun appears reddish-yellow and the sky surrounding the Sun is colored, the scattered blue waves.

When the Sun is lower in the horizon (near sunrise or sunset), the sunlight must travel through a greater and longer thicknesses of atmosphere than it does when it is overhead, and even more light is scattered (not just blue, but also green, yellow, and orange) before the light reaches your eyes. This makes the sun look a-lot more red.