NASA astronaut Scott Kelly landed safely in Kazakhstan Tuesday evening, putting an end to his nearly year-long stay aboard the International Space Station. A Russian Soyuz capsule brought Kelly and two of his Russian fellow crew members home, a seven-hour-trip. Kelly has now concluded the spaceflight portion of NASA’s One-Year Mission — an experiment to see how astronauts’ bodies change during 340 days aboard the ISS.
Kelly and fellow One-Year Mission participant Mikhail Kornienko will undergo field tests to see how well the two astronauts are doing as they return to Earth. Living in microgravity for longer than six months can change the body’s circulation and disturb a person’s sense of balance, making it difficult to re-adjust to gravity again.
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This article originally appeared on Recode.net.