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You send an astronaut on a mission to deliver a present to one of your best...

You send an astronaut on a mission to deliver a present to one of your best friends who lives on a planet orbiting Bernard’s star (6.0 light years away from Earth). The space ship travels at 75% of the speed of light. Assume that the astronaut returns directly after delivering the letter.

How much older will the astronaut be when she returns?

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