An object's length would be negative in a frame where it travels faster than the speed of light.

Question

Quizplus · Accepted Answer

According to the theory of relativity, an object cannot travel faster than the speed of light in a vacuum, and thus its length cannot be negative; instead, lengths contract as they approach the speed of light, but never become negative.  If $\beta>1$, then $L=\sqrt{1-\beta^{2}} L_{R}$, then $L$ is imaginary, signalling that the equation does not apply.

An Object's Length Would Be Negative in a Frame Where