Answer to Question #249915 in Physics for rhani

Question

1. An astronaut leaves earth and travels at 0.92c. He spends 15 years exploring space. When he returns, how much time will have passed on Earth?

Answer 1

The time on Earth is

$$t_0=\frac{t}{\sqrt{1-v^2/c^2}}=38.3\text{ years}.$$