Length Contraction:A phenomenon in special relativity where an object's measured length decreases when it moves relative to an observer.
Lorentz Factor:A factor $\gamma = \frac{1}{\sqrt{1 - \frac{v^2}{c^2}}}$ used in relativity equations to account for time dilation and length contraction.
Relativity:The theory proposed by Albert Einstein that describes how measurements of space and time vary for observers in different states of motion.