Answer to Blue Sky Trivia

Q. Why does the sky look darker when you look up from a cruising airplane?

A. When flying in an airplane at 34,000 feet, you are above 75 percent of the atmosphere. If you look out and up, you’ll notice the sky is a much darker blue than you’re used to seeing. This is because you’re seeing some sky, but also some of outer space.

Source: Weather Questions .

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