Christina Koch returned from a 328 mission aboard the ISS. In college we learned that she would not experience time the same as us on earth over the 328 days. How can this be true and by how much younger would she be than you or I?

Question

In my undergrad physics course we were taught the basics of relativity. It was explained to us that something moving near the speed of light can somewhat time travel when compared to a stationary observer. So, how much younger would [Astronaut Koch](https://www.google.com/amp/s/amp.usatoday.com/amp/4676940002) be than us and how does this phenomena work?

In: Physics

Answer 1

>So, how much younger would Astronaut Koch be than us and how does this phenomena work?

The faster you go, the slower your clock runs (according to others), and the higher you are up out of a gravity well, the slower your clock runs (again, according to others). However, these effects are more or less negligible at ISS orbital speeds and altitudes.