Why are sunsets red?

Answer

According to the Old Dominion University, sunsets get their red color because light is refracted by particles that are in the atmosphere and the red spectrum is the one that is visible. The sky can also have shades of orange, yellow and purple when the sun begins to set.

The different colors in the sky mean the colors with the shortest wavelengths, including blue, have already scattered off in numerous directions and are no longer visible. Orange sunsets appear when the air is most clean and red sunsets occur when the red wavelengths bounce off low-lying clouds.

The composition of the earth’s atmosphere is one factor that will determine what color the sky is when the sun sets. The atmosphere is made of gases and particles, and because it surrounds the earth it affects everything that is visible. Light is an energy that travels in waves and it is part of the electromagnetic spectrum. It also moves in a straight line unless it is interfered with. As the sun sets, the light bumps into the particles that are left in the atmosphere. At first, the lights appears white because it has all of the same colors, but as it bounces off the particles in the air the higher frequencies of lights are absorbed faster and you are left with the lower frequencies of red, orange and yellow.

Q&A Related to "Why are sunsets red?"
The color red occurs on the horizon at sunset due to the Rayleigh Scattering affect. Light scatters off of small particles in the atmosphere. The wavelengths of blue light are smaller
http://www.ask.com/web-answers/Science/Astronomy/w...
The color of the sunset is a result of the human eye viewing the sun through more and more ozone; as the sun approaches the horizon, there is more ozone through which you are looking
http://wiki.answers.com/Q/Why_are_sunsets_often_re...
Sunsets are red because by the time the sun is on the horizon, all of the blue light has already
http://www.chacha.com/question/why-are-sunsets-red...
The Tyndall effect, also commonly known as Rayleigh scattering, first came under the observation of the scientist John Tyndall in 1859, the University of California at Riverside states
http://www.ehow.com/info_8694960_causes-red-sunset...
1 Additional Answer
Ask.com Answer for: why is the sunset red
At sunset, the sun's light passes farther through the atmosphere, deflecting and decreasing the blue in the air. Scattering by dust particles and pollution in the air causes the sunset to appear red.
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