You might have seen the headlines proclaiming astronaut Scott Kelly has returned from a year on the International Space Station with a whopping 7% change in his DNA. That was when compared to his identical twin, Mark Kelly, back on earth.

Space travel affects our bodies in ways we still don’t quite understand, but there’s more to this headline than meets the eye.

We go behind the news with Digital Futures regular Joshua Chou, Director of Biomedical Engineering at the University of Technology Sydney.

To find out more about the terrifying things that happen to your body in space, check out our episode on space health.