SpaceX has rolled out the rocket and Crew Dragon capsule that will launch the Fram2 astronaut mission on Monday night (March 31).

The physical toll of extended time in space can be seen clearly in “before and after” photos of astronauts. These transformations highlight how being stranded in space can affect their appearance and health.

Previous studies have also demonstrated potential links between space travel and an increase in oxidative stress, which experts have suggested contributes to aging and, in turn, graying hair. However, no study has directly linked spaceflight-related oxidative stress to hair color changes.

Suni Williams and Butch Wilmore spoke in their first news conference since returning to Earth two weeks ago from an unexpectedly long I.S.S. stay that lasted more than nine months.