why does the sky turn red at sunset?

Answer 1

When the sun is low in the horizon, the sunlight has to travel through more particles in the atmosphere.

You see sunlight as white, but it's made up as a combination of the colors of the spectrum.

Those particles will tend to scatter away the blue and green light part of the sunlight's spectrum, leaving behind the more-difficult-to-scatter red and orange colors. That's because red and orange lights has a longer wavelength than the blue and greens, making it less affected by particles.

Pollution, ash or smoke can enhance the colors as there's more particles to scatter away the shorter-wavelength part of the spectrum.

Answer 2

The colors we see in the sky are due to the rays of sunlight being split into colors of the spectrum as they pass through the atmosphere and ricochet off the water vapor and particles in the atmosphere. The amounts of water vapor and dust particles in the atmosphere are good indicators of weather conditions. They also determine which colors we will see in the sky.
During sunrise and sunset the sun is low in the sky, and it transmits light through the thickest part of the atmosphere. A red sky suggests an atmosphere loaded with dust and moisture particles. We see the red, because red wavelengths (the longest in the color spectrum) are breaking through the atmosphere. The shorter wavelengths, such as blue, are scattered and broken up.

When we see a red sky at night, this means that the setting sun is sending its light through a high concentration of dust particles. This usually indicates high pressure and stable air coming in from the west. Basically good weather will follow.
A red sunrise reflects the dust particles of a system that has just passed from the west. This indicates that a storm system may be moving to the east. If the morning sky is a deep fiery red, it means a high water content in the atmosphere. So, rain is on its way.

Answer 3

The sky turn red at sunset because the sun rays go thru the dust in the atmosphere

Answer 4

The longest path of sunlight through the atmosphere is at sunrise and sunset. So, when the frequency of light is high (blue and violet), it is scattered most and the lower the frequency of light (yellow to orange to red-orange) scattered least when it travels a very long distance. That's why the sunset is red.

Answer 5

Diffraction of the suns rays through the sky, makes it look red, i think!

Answer 6

It is the sun rays shining through the clouds and it sets. It's the same with sunrise.

Answer 7

It's just the way the sun's lightwaves filter through the atmosphere on the horizon.

Answer 8

This usually follows a hot day and shows that there is a lot of dust in the atmosphere.

Answer 9

Red sky at night, Sailors delight (no rain)
Red sky in morning, Sailors take warning (will rain)

Answer 10

because the light reflects off dust in the atmosphere.