Answer to Question #87688 in Mechanics | Relativity for Nick

Question

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

$$t'=\frac{t}{\sqrt{1-(\frac{v}{c})^2}}$$

$$t'=\frac{15}{\sqrt{1-0.92^2}}=38 years$$