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How fast does light move in the air and in outer space?

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How fast does light move in the air and in outer space?

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  1. 3 x 10^8 m


  2. 3*10^8 meters/second

  3. "The speed of light when it passes through a transparent or translucent material medium, like glass or air, is less than its speed in a vacuum. The ratio of the speed of light in the vacuum to the observed phase velocity is called the refractive index of the medium."

    http://en.wikipedia.org/wiki/Speed_of_li...

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