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You can see a clock in a spaceship moving past you at 90 percent of the speed of light. according to you, how much time would pass while the clock in the spaceship ticked through one minute?

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t = \gamma\tau, \textnormal{ where } \gamma \equiv \frac{1}{\sqrt{1-(v^2)/(c^2)}}, \textnormal{ }\tau \textnormal{ is the proper time 60s} \\ t = (60s)/(√(1-0.9^2)) = 137.65s \textnormal{ } (5 s.f.)
User Brendan Weinstein
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