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Why is it Dark at Night?

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 Physics   |   Science
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Have you ever wondered why you look up and see a dark sky at night?
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Music by Nathaniel Schroeder

Thanks to Nima Doroud and Niayesh Afshordi for contributions and to Perimeter Institute for support.
http://www.perimeterinstitute.ca

Created by Henry Reich Created by Henry Reich

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