Why is it Dark at Night?

2012-09-30

[public] 4.46M views, 79.3K likes, 1.10K dislikes audio only

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.

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Created by Henry Reich Created by Henry Reich