a- A certain star is 18.618.6 light-years away. How long would it take a spacecraft traveling 0.950c to reach that star from Earth, as measured by observers on Earth? 19.6 years   b- How long would it take a spacecraft traveling 0.950c to reach that star from Earth, as measured by observers on the spacecraft?   6.11 years 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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