To outside observers at rest, the overall sizes of objects traveling at relativistic speeds are
A)larger.
B)smaller.
C)the same size.

Question

Quizplus · Accepted Answer

According to the theory of relativity, objects traveling at relativistic speeds experience length contraction along their direction of motion. Therefore, an object's length will appear shorter to an outside observer at rest, making it smaller.

To Outside Observers at Rest, the Overall Sizes of Objects