According to Einstein's Special Theory of Relativity, as the velocity of an object increases relative to an observer in an inertial frame, its length becomes contracted according to

where $l_0$ is the rest length of the object relative to an observer in the inertial frame, $l'$ is the contracted length of the moving object according to the same observer and ${\gamma}$ is the Lorentz Factor.

See also Time Dilation

Further reading:

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