3 astronauts make their way home |

We are back with three dramatic episodes of A Year in Space, which take you through Scott Kelly and Mikhail Kornienko's last days aboard the International Space Station and their subsequent—and harrowing—trip home. Watch the series at time.com/space.

It's been a long year for Kelly and Kornienko, and there has been no shortage of challenges—from exploding supply rockets to a close call with a passing Russian satellite. Then there are the simple human hardships of separating yourself from your friends, family—and from something as basic as gravity. The toll on the astronauts' bodies and minds is yet to be determined, but what we do know is that the science that Kelly and Kornienko did during their year aloft, combined with the studies on Scott's identical twin, Mark, back on Earth, will yield important results both for humans living on the planet and humans hoping to venture far from it.

In just over a week, we'll have one final installment and that'll be it for the series! We hope you have enjoyed following the journey as much as we have enjoyed producing it.

We live in an era in which too many people have forgotten the courage and the resolve it takes to travel in space. Yes, the missions are thrilling, but they are also grueling and very dangerous, especially when explorers commit themselves to spending a year off the planet. A day in space means 16 trips around the Earth, 16 sunrises and sunsets, and 16 opportunities to watch the planet crawl by below, always in your sight—but always out of reach. Imagine living there for an entire year.

A Year in Space follows Astronaut Scott Kelly during his record-setting one-year stay aboard the International Space Station—part of an ambitious experiment to determine if humanity's grand dreams of traveling to Mars can ever be achieved. With unprecedented access, TIME's filmmakers chronicle Kelly's mission in a 12-episode series. A Year in Space also follows Scott's family back home, including his twin brother Mark—a retired NASA astronaut—who is serving as the other half of a unique controlled experiment, comparing how identical bodies and identical genomes respond to a year in decidedly non-identical environments. In A Year in Space, technology, biology and the ambitions of humanity converge in ways they never have before.

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