| Definition: | phenomenon describing the fact that for a moving object in a given frame, its local length in the direction of moving is shorter than its proper length in the same direction
Note 1 to entry: In the moving frame S′, d′=ℓ/γ
where ℓ is proper length, d′ is the length measured in S′ (local length in S′) and γ is the Lorentz factor.
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