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Why is it Dark at Night?


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Have you ever wondered why you look up and see a dark sky at night?Help share science with the world: to MinutePhysics! is on Google+ - And facebook - twitter - @minutephysicsMinute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!Music by Nathaniel SchroederThanks to Nima Doroud and Niayesh Afshordi for contributions and to Perimeter Institute for



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