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Monday, 21 May 2007

Why is the sky blue?

the sky is actually just make up of air, as such, the sky actually has no colour. However, the sky is blue in colour because our human eye percieve it to be. Sound confusing? i will try to make things simple.

The sun creates light and heat. To answer why is the sky blue, we only need to know that the light created by the sun travels to Earth at the speed of light, which is about 3 x 10*8 m/s. in another words, light can move round the whole diameter of this planet 7 and a half times in ONE SECOND!!!

well, thats no the main point. the thing is, when the light rays enter the Earth's atmosphere, the air scatters the light. In the normal white light we see, it consist of seven coulours, red, orange, yellow, green, blue, violet and purple.

Since the air scatters sunlight, the blue we see in the sky is actually the scattered blue light rays.
the other colour light rays are also passing through the atmosphere, but when the atmosphere makes the light rays deflect back into space, it mostly the other colour light rays that get deflected, leaving the blue light rays to pass through, thus making the sky look blue.

questions answered.

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