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"
The sky is rarely red in the morning, and very little is it at night. The reason though is because of the sun setting and rising.
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Nighttime headaches or headaches upon waking affect thousands of people each year. For some, this can occur every night and may be a sign of more serious conditions.
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