A space ship travels to a star 9 light-years away at 0.8c 0.8 ext{c} and comes back. How much time passes on the space-ship during the journey (as measured by an astronaut)?

Question

A space ship travels to a star 9 light-years away at 0.8c 0.8	ext{c} and comes back. How much time passes on the space-ship during the journey (as measured by an astronaut)?

Accepted Answer

ক. 13.5 years

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