Question: ( kjf 4 th ed . , problem 2 7 . 2 4 ) an astronaut travels to a system 4 . 1 lyr awayat

(kjf 4th ed., problem 27.24) an astronaut travels to a system 4.1 lyr awayat a speed of 0.9c. assume the time needed to accelerate and decelerate is negligible. (a) how long does the journey take according to mission control on earth? (b) how long does the journey take according to the astronaut?

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