How far is a second?

Physics
The moon may be 1.3 light-seconds away, but why on earth do we measure distances using time?

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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!! — http://juliansaporiti.bandcamp.com/album/lusitania
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Thanks to Ross Diener for contributions and to Perimeter Institute for support. Created by Henry Reich

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