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Black HoleTrainSunClockE=mc2Radioactivity SymbolTwin ParadoxLight Cone Twin Paradox

Imagine a pair of twins. The first twin, an astronaut, goes on a long trip into space, traveling at close to the speed of light. According to relativity, when the first twin comes back he will be much younger than the second twin. The details of this “thought experiment” have been the subject of much discussion.

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Twin Paradox Kid


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