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ironirc

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Now, let's introduce an observer located 100 light-years away, positioned perpendicularly to the path between A and B. This observer will witness the events 100 years later due to the speed of light. Given that the distance between the observer and B is initially 100 light-years and B moves only 1 light-year away, the relative velocity between the observer and B remains relatively low. Therefore, I argue that only minimal relativistic effects come into play for the observer.

My conclusion is that from the observer's perspective, there's almost no discernible difference in age between A and B when they reunite. This seems to contradict what A and B experience.