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Relativity - Twins Paradox

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On his 25th birthday, Peter leaves his twin Paul behind on the earth and goes off in a straight line for 7 years of his time at a speed of 0.96c. Peter then reverses direction and returns at the same speed.

What are the ages of Peter and Paul at the moment of reunion?

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This famous problem of twins paradox has been solved step by step.

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Twin paradox

On his 25th birthday, Peter leaves his twin Paul behind on the earth and goes off in a straight line for 7 years of his time at a speed of 0.96c.  Peter then reverses direction and returns ...

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