Question: A spaceship departs from earth for the star Alpha Centauri, which is 4 light-years away. The spaceship travels at 0.75c. How long does it take

A spaceship departs from earth for the star Alpha Centauri, which is 4 light-years away. The spaceship travels at 0.75c. How long does it take to get there

(a) As measured on earth and

(b) As measured by a passenger on the spaceship?

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