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by aidenn0
811 days ago
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If they just pass by each other without changing speeds, each sees the other as experiencing slower time. For the case where one leaves and comes back, see the Twin paradox[1] which is resolved by the simple fact that to change speeds one must accelerate (or that the one who returns must have experienced at a minimum two different frames of references; one to leave and one to return). 1: https://en.wikipedia.org/wiki/Twin_paradox |
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