What Causes a Red Sky at Night?

Answer

The red sky at night is normally caused by the scattering of the sunlight by the different constituents of the atmosphere. This is because air molecules scatter the blue light more effectively than the red part of the sunlight and this then causes the orange-like colour of the setting or rising sun.
Q&A Related to "What Causes a Red Sky at Night"
In order for a sky to transform from the blue wavelength to the orange, and then to the red spectrum, the sun's position in the sky is involved, relative to the horizon. The atmosphere
http://www.ehow.com/info_8460402_causes-red-lines-...
Refraction of the sun's light below the hoizon. The red light is the one at the lower end of the refraction and is seen last. The red light refracts and lights up the clouds.
http://wiki.answers.com/Q/Why_is_the_sky_red_at_ni...
Red sky at night, sailor's delight. Red sky in morning, sailor's warning.
http://www.chacha.com/question/what-is-red-skies-a...
Red skies at night indicate that good weather is on its way eastward toward you. (I'm not sure of the exact cause of the redness. The other part of the saying is "red skies at
http://answers.yahoo.com/question/index?qid=200807...
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