Astronaut A boards a spaceship leaving earth for the star Alpha Centauri, 4 light-years from earth, while
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Astronaut A boards a spaceship leaving earth for the star Alpha Centauri, 4 light-years from earth, while her friend B stays at home. The ship travels at speed \(4 / 5 c\), and upon arrival immediately turns around and travels back to earth at the same speed 4/5 \(c\).
(a) How much has A aged during the entire trip?
(b) How much has B aged during the time A has been gone?
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