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# A certain star is 10.6 light-years away. How long would it take a spacecraft traveling 0.960 c to reach that star from Earth, as measured by observers: on the spacecraft?

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Knowns: The travel time in Earth's frame of reference: $\Delta t = 11.0 \mathrm{\ years}$ The travel speed of the spacecraft: $v = 0.960c$

Unknowns: The time $\Delta t_\mathrm{Earth}$ it will take to reach the certain star from Earth, in Earth's frame of reference

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