Why is it Dark at Night?

Have you ever wondered why you look up and see a dark sky at night? Help share science with the world: http://translate.minutephysics.com Subscribe to MinutePhysics! MinutePhysics is on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter - @minutephysics Minute Physics provides a

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