**
Lorentz-Fitzgeral length contraction.** The effect of
lengths shortening when something travels at or near the speed of light. Even
things that do not travel at the speed of light will shorten, but by a smaller
factor. The basic formula is L' = L¡Ô 1 - v^{2}/c^{2}
where L' is the length of object in a moving frame of reference (frame where the
ruler is moving compared to observer), L is the length of the object in its
inertial frame of reference (frame where the ruler is not moving compared to
observer), v is the speed of the L' frame and c is the speed of light.