MadSci FAQ: Why is the sky blue?

By far and away, the mostly commonly asked question of MadSci. A search of why sky blue at the MadSci search engine will locate many more.

Grade K-3
    Why is the sky blue in the day and black at night?

Grade 4-6
    Why is the sky blue?

Grade 10-12
    Why is the sky blue?

    I am looking for an experiment that a young child can do to help explain why the sky is blue.
    Are there other atmospheres that might scatter other colors of light? 

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