Identical twins A and B are separated at birth, A staying home and B traveling at constant speed (12/13)c toward a distant star. Upon arrival, B quickly turns around and travels back home at the same speed. When B arrives home, she finds that she is 32 years younger than A. (a) How old is each twin when B arrives back home?

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.