Scott Kelly, Mikhail Kornienko returning to Earth after year in space

CAPE CANAVERAL, Fla. -- Astronaut Scott Kelly closed the door Tuesday to an unprecedented year in space for NASA, flying back to the planet and loved ones he left behind last March.

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Kelly and his roommate for the past 340 days, Russian cosmonaut Mikhail Kornienko, check out of the International Space Station on Tuesday night, U.S. time.

By the time their capsule lands in Kazakhstan on Wednesday, the pair will have travelled 144 million miles through space, circled the world 5,440 times and experienced 10,880 orbital sunrises and sunsets.

Kelly photographed the first five sunrises of his waking day Tuesday, posting the pictures on Twitter, before quipping, "I gotta go!" His final tweet from orbit came several hours later: "The journey isn't over. Follow me as I rediscover .Earth!"

Piloting the Soyuz capsule home for Kelly, 52, and Kornienko, 55, will be the much fresher and decade younger cosmonaut Sergey Volkov, whose space station stint lasted the typical six months.

Kelly was the first one into the docked Soyuz capsule after a round of hugs and handshakes with the three crewmen staying behind. Kornienko reached out and patted the inside of the station before the hatches swung shut.

The two yearlong spacemen will undergo a series of medical tests following touchdown. Before committing to even longer Mars missions, NASA wants to know the limits of the human body for a year, minus gravity.

As he relinquished command of the space station Monday, Kelly noted that he and Kornienko "have been up here for a really, really long time" and have been jokingly telling one another, "We did it!" and "We made it!"

"A year now seems longer than I thought it would be," Kelly confided a couple weeks ago.

Not quite a year -- 340 days to be precise, based on the Russian launch and landing schedule. But still record-smashing for NASA.

Kelly's closest U.S. contender trails him by 125 days. Russia continues to rule, however, when it comes to long-duration spaceflight. The world record of 438 days was set by a Russian doctor during the mid-1990s.

"A really smart person said to me one time, 'Teamwork makes the dreamwork in spaceflight,' and spaceflight is the biggest team sport there is," Kelly said Monday. He acknowledged each of the 13 U.S., Russian, European and Japanese space fliers with whom he and Kornienko lived during the past year. "It's incredibly important that we all work together to make what is seemingly impossible, possible."

For NASA, that mission possible is Mars.

Scientists are hoping for more one-year subjects as NASA gears up for human expeditions to Mars in the 2030s. Radiation will be a top challenge, along with the body and mind's durability on what will be a 2 1/2-year journey round trip.

The choice of the pioneering Kelly turned out to be a bonanza. His identical twin, retired astronaut Mark Kelly, offered himself up as a medical guinea pig so researchers could study the differences between the genetic doubles, one in space and the other on the ground. They provided blood, saliva and urine samples, underwent ultrasounds and bone scans, got flu shots and more, all in the name of science.

Once on the ground, Kelly and Kornienko split. Kelly heads to Houston with two flight surgeons and several other NASA reps, arriving late Wednesday night. That's where he'll be reunited with his two daughters, ages 21 and 12; his girlfriend, a NASA public affairs representative at Johnson Space Center; and his brother. Kornienko returns to his home in Star City, Russia, near Moscow, his wife, daughter and toddler grandson.

Kelly has spent more time in space, altogether, than any other American: 520 days over the course of four missions. Realizing this is likely his last journey, it was "a little bittersweet" saying goodbye to his orbiting home. He'll have plenty of pictures, at least, for the scrapbook -- he posted 1,000 dramatic, colour-drenched pictures of Earth on his Twitter and Instagram accounts.

"What a ride he took us on!" fellow astronaut Reid Wiseman said in a tweet from Earth.

"Those of us who dream of sending astronauts to deep space thank Scott Kelly for his sacrifice," said Jim Green, director of planetary science for NASA, "and are thrilled to welcome him home."


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