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How far is a second?

The moon may be 1.3 light-seconds away, but why on earth do we measure distances using time? minutephysics is now on Google+ - And facebook - And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Music by Nathaniel Schroeder NEW ALBUM!! -- youtube: Thanks to Ross Diener for contributions and to Perimeter Institute for support.
Length: 01:30


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