How long does she measure for the time she is away

Reference no: EM13260226

Your friend, who is exactly the same age as you, travels at a speed of 0.9990c to a star 25 light-years away. She spends 10 years on one of the star's planets and then returns at 0.999c.

(a) How long has she been away as measured by you?

(b) How long does she measure for the time she is away?

Reference no: EM13260226

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