Astronauts to return from One-Year Mission on space station Tuesday night

Throughout their almost year-long stay in space, Kelly, 52, and Kornienko, 55, have been the subjects for dozens of medical experiments and science studies created to learn more about how weightlessness and the high radiation environment of space impact the human body.
The Soyuz TMA-18M carrying Scott Kelly, Mikhail Kornienko and Sergey Volkov drifts safely back to Earth.
The 340-day mission saw Kelly break the record for the longest single stay in space by a USA astronaut, while Kornienko is now fifth on the list for lengthiest mission by a Russian cosmonaut. Russian cosmonaut Valeri Polyakov holds the record for spending 437 days, the longest cumulative time in space.
NASA says it'll be 6-12 months until we see any hard, published data from Kelly's tenure in space but, whatever they find, it'll help us get one step closer to exploring our Solar System. Kelly is helping NASA develop protocols and techniques the agency will use for a crewed mission to Mars.
Now, the "Human Research Programme" is building on that foundation by proposing more global collaboration on future one-year space station missions. Scientists will be comparing his body and mental state to that of his twin brother, Mark Kelly, who was on Earth during the same period.
Soon Kelly will be headed back to Houston, Texas, where he will continue to undergo testing for the One-Year Mission.
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United States astronaut Scott Kelly (R) and Russian cosmonauts Sergei Volkov (C) and Mikhail Korniyenko, surrounded by ground personnel, rest shortly after landing near the town of Dzhezkazgan (Zhezkazgan), Kazakhstan, March 2, 2016.
Travis Schenck of the Space Foundation said, "He's been in space for over 340 days but he's actually tweeted over a thousand times".
Kelly is scheduled to return to America late Wednesday after landing in Kazakhstan Tuesday night.
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Outside of the antics and stunning photographs he captured in orbit, Kelly was part of a bigger experiment for NASA.
"Leaving this incredible facility is going to be tough, because I probably will never see it again", Kelly said.
"I could go for another 100 days or 100 years", the astronaut said during his final briefing with reporters. Such Earth-reliant exploration will lead to more complex operations in orbit around the moon where NASA will demonstrate, advance, and validate the capabilities and technologies we will need to send humans to Mars.
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