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A comment on The Future of Humanity with Elon Musk: Interview by Neil DeGrasse Tyson. Parent comment

Re:The Future of Humanity with Elon Musk: Interview by Neil ... by simonh on Monday March 23, 2015 @11:28AM (#9251400)
Sorry, but that's wrong. The person in the ship would experience a shorter journey than would be measured by external observers.

http://en.wikipedia.org/wiki/Twin_paradox

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