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Question:
Why is the sky sometimes red at night and is this similar to a blue sky during the day?



Replies:
No, the red sky you see at dusk is the result of dust and smoke particles in the air which absorb blue light but allow red light to pass through. In a way, it is similar, since the blue sky you see during the day is the result of the water in the air absorbing RED light and allowing BLUE light to pass through.

Wordsworth


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