I am struggling to understand what frame of reference means in relativity. Imagine the twin scenario. Twin A is at rest, while twin B travels somewhere and back at near the speed of light. If one takes as a frame of reference the one where twin A is at rest, then time goes slowly for Twin B, thus making it so that when B returns, A is older. Now I get really confused, if I take twin B's rest frame as the frame of reference, then he was stationary all the time, and A was moving at close to the speed of light, thus B will be older than A. What am I getting wrong here?
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B is the only one that accelerates. Look up the solution to the twin paradox – Jim Jan 07 '15 at 14:34
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1possible duplicate of How is the classical twin paradox resolved? – Jim Jan 07 '15 at 14:35