One question readers ask more than almost any other is: “Why is the sky blue?”
The short answer is that the sky is blue due to the Earth’s atmosphere and the way it reflects the sun’s light.
But that’s certainly not good enough of an answer, so let’s dig a little deeper.
Firstly, you should know that the Sun’s light is made up of all the seven colors of the rainbow: Red, Orange, Yellow, Green, Blue, Indigo and Violet (You know, Roy G. Biv). Those colors of lights travel in waves, each of different size and frequency.
Typically, all light travels in somewhat straight line, unless something gets in it’s way. Like a mirror or prism. Or in the case of the Earth’s atmosphere, molecules and gas.
Sunlight reaches Earth’s atmosphere and is scattered in all directions by all the gases and particles in the air. The blue light is scattered more than the other colors because it travels in shorter, smaller waves. So, we see more blue light in the sky than any other color, making the sky look blue.
But what about sunset, when the sky or orange or red or purple? Great question.
As the Sun gets lower in the sky, its light passes through more of our atmosphere to reach us. So, even more of the blue light is scattered, which allows the reds and yellows to pass straight through to our eyes.
Still confused? Take a look at this video explanation:
Have a better grasp on the the whole “Why is the sky Blue” question?
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