How old are they when john returns

Reference no: EM13305402

John takes off for Vega (d ~ 25LY) traveling at 99.99% the speed of light. As soon as he arives, the ship turns around and comes back to Earth. Bob stays at hom on Earth. They are both 25 years old when John leaves. How old are they when John returns? expleain any terms in use.

Reference no: EM13305402

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