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Twin paradox
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=== Conclusion === {| class="wikitable" |+ Readings on Earth's and spaceship's clocks ! Event || Earth<br>(years) !! Spaceship<br>(years) |- | Departure || 0 || 0 |- | End of outgoing trip =<br>Beginning of ingoing trip || 5 || 3 |- | Arrival || 10 || 6 |} No matter what method they use to predict the clock readings, everybody will agree about them. If twins are born on the day the ship leaves, and one goes on the journey while the other stays on Earth, they will meet again when the traveler is 6 years old and the stay-at-home twin is 10 years old.
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