The relativistic effect where objects appear shorter in the direction of motion when observed from a reference frame moving relative to the object. This contraction only occurs at speeds approaching the speed of light and is described by Einstein's special theory of relativity.
Coined in early 20th century physics from 'length' (Old English 'lengthu') and 'contraction' (Latin 'contractio'). The concept emerged from Lorentz transformations before Einstein's 1905 special relativity paper, initially called 'Lorentz contraction' after Hendrik Lorentz.
A meter stick flying past you at 90% the speed of light would appear only 44 centimeters long, but if you were riding on that meter stick, it would still measure exactly one meter to you! This isn't an optical illusion or measurement error—space itself is literally contracted from your perspective.
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