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If astronauts could travel at v = 0.990c, we on Earth would say it takes(4.20 / 0.990) = 4.24 years to reach Alpha Centauri, 4.20 light-years away. The astronauts disagree.
(a) Find how much time passes on the astronauts clocks? years
(b) Find the distance to Alpha Centauri as measured by the astronauts?
light-years
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