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Looking at the Eath's surface, the sky on different colors depending on the time. If day, displays a blue; if at the end of the afternoon, reds win; if night, turns black.
We see the sky
Astronauts always see the dark sky. So why do we get to see blues, reds and oranges? Have you ever stopped to think about it?
Because all this happens because of the way the light scatters through the atmosphere! It may seem strange, but the light is a form of energy that travels through space like a wave. This same: a wave! That only a very small wave: to find the length of a wave of sunlight, for example one millimeter would need to divide into a thousand equal parts.
A popular saying curious
The proverb says: that size does not matter does not apply to light. You know why? For the size of the wave described by this form of energy determines exactly the color she has. The smaller waves are blue; the longest waves are red.
Have done an experiment with a prism? The prism is na object made of glass or crystal used to decompose sunlight. I've Certainly heard of that white light is the union of all colors, is not it? For white sunlight just being formed by waves of different sizes. With the help of a prism, we can see the colored beams that form.
When sunlight reaches Earth, it encounters na obstacle: the atmosphere, ie, the large mass of air that envelops the planet. By bumping into air molecules, waves of different sizes begin to spread each one way. Waves of short length spread. And what color the smallest light wave? Exactly: blue!
This mechanism also explains the color variations in the sky. In addition to the air molecules are suspended in the atmosphere, dust particles. When these particles are smaller than the waves, causing an even greater spread of light. The blue waves spread far, you end up diluting, allowing us to see the longest waves as red and yellow.