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36.2 The Twin Paradox
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Is the Twin Paradox rightly described as an example of time travel?
Does special relativity provide a prescription for going back in time?
Why is there such a difference between going forward and going backward in time?
Is any of this related to time slowing down near massive objects?
What if we got rid of accelerations by teaming Gracie with someone else, say Germaine, who is heading toward Earth? Imagine that Germaine synchs her clock with Gracie’s as she passes. When Germaine passes George, whose clock will show elapsed time?