January 17, 2012

General Information Part 2

Why is the sky blue?

Light reaches the earth from the Sun. Sunlight looks white, but is actually a mixture of all the colors in the rainbow. When light rays from the Sun passes through the atmosphere, some are scattered by the tiny bits of dust and water in the air. Blue rays are scattered most and reach our eyes from all angles. We see more blue than any other color and this makes the sky look blue.

Why are sunsets red?

At sunset the Sun is low in the sky and farther away from us we look towards it. The light rays from the sun have to pass through more layers of air to reach our eyes. This extra air scatters out all the colors in the sunlight except red. Only the red rays come straight to our eyes and so we see a red sunset.

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