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

Well, there is a time dilation that can happen because of gravity, and one that happens because of speed. Though i cant tell you when a significant change will be, the ISS does not have a significant change, atleast not one that cant be properly adjusted for. In 6 months the ISS will lag 0,007 seconds behind earth, which would only mean shes 1/700th of a second younger after a year in space.