Tuesday will mark the 171st of the planned 342 days for NASA astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko to spend on the International Space Station as the One Year Crew. NASA released a video to observe the milestone with Billy Dee Williams narrating.

As the video says this type of research is necessary before a future Mark Watney can become The Martian.

One day soon humans will set foot on Mars and it’s the science being conducted today aboard the International Space Station that will help us get there.

via NASA