Problem

The international space station travels in orbit at a speed of 7.67 km/s. If an astronaut and his brother start a stop watch at the same time, on Earth, and then the astronaut spends 6 months on the space station, what is the difference in time on their stopwatches when the astronaut returns to Earth? Note that 6 months is about 1.577 x 10^{7} s, and c = 3 x 10 ^{8} m/s.

A

1.00000000033 s

B

0.9999999993 s

C

0.9999999997 s

D

0.0052 s

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