Question: A star is 21.6 light-years from Earth. How long would it take a spacecraft traveling 0.950c to reach that star as measured by observers? (a)

A star is 21.6 light-years from Earth. How long would it take a spacecraft traveling 0.950c to reach that star as measured by observers?
(a) On Earth,
(b) On the spacecraft?
(c) What is the distance traveled according to observers on the spacecraft?
(d) What will the spacecraft occupants compute their speed to be from the results of (b) and (c)?

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