Time dilation raises the situation known as “the twin paradox”. One twin stays on Earth, while the other boards a spaceship and flies off at speeds nearing c. This problem is often considered a paradox, because the principle of relativity demands that no inertial frame of reference be preferred over another. In other words, relativity’s effects should be reversibly simply by looking at them from another viewpoint. Both siblings will see each other flying away from each other, and each can claim that the other should be younger. However, the one that boards the spaceship has accelerated and decelerated, and thus the frame of reference of the spaceship has not remained inertial. Only the Earth twin can apply time dilation in this situation because only this twin has an inertial frame of reference. Hence, the two frames of reference are not equivalent and there is no paradox because the one that stays on Earth will be younger.
hmm in the red font section, even though the two frames of reference are not euqivalent, according to macquaire study guide it shows that from general theory of relativity it is because the twin on the spacecraft experiences acceleration thus will age more slowly, then shouldn't the twin on the spacecraft age slower relative to the twin on Earth
hmm in the red font section, even though the two frames of reference are not euqivalent, according to macquaire study guide it shows that from general theory of relativity it is because the twin on the spacecraft experiences acceleration thus will age more slowly, then shouldn't the twin on the spacecraft age slower relative to the twin on Earth
