In physics, the twin paradox is a thought experiment in special relativity involving identical twins, one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more. This result appears puzzling because each twin sees the other twin as moving, and so, according to an incorrect   and naive   application of time dilation and the principle of relativity , each should paradoxically find the other to have aged less. However, this scenario can be resolved within the standard framework of special relativity: Therefore, the twin paradox is not a paradox in the sense of a logical contradiction. Starting with Paul Langevin in , there have been various explanations of this paradox. These explanations "can be grouped into those that focus on the effect of different standards of simultaneity in different frames, and those that designate the acceleration [experienced by the travelling twin] as the main reason".
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