If astronauts could travel at v 0950c we on earth would, Ask an Expert

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If astronauts could travel at v = 0.950c, we on Earth would say it takes (4.20 / 0.950) = 4.42 years to reach Alpha Centauri, 4.20 light-years away. The astronauts disagree.

(a) How much time passes on the astronauts' clocks?

years

(b) What is the distance to Alpha Centauri as measured by the astronauts?

light-years

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