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NASA Astronaut Scott Kelly is seen inside a Soyuz simulator at the Gagarin Cosmonaut Training Center (GCTC), Wednesday, March 4, 2015 in Star City, Russia. Kelly, along with Expedition 43 Russian cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos). (Photo by Bill Ingalls/NASA)

NASA Astronaut Scott Kelly is seen inside a Soyuz simulator at the Gagarin Cosmonaut Training Center (GCTC), Wednesday, March 4, 2015 in Star City, Russia. Kelly, along with Expedition 43 Russian cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), and Russian cosmonaut Gennady Padalka of Roscosmos were at GCTC for the second day of qualification exams in preparation for their launch to the International Space Station onboard a Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. (Photo by Bill Ingalls/NASA)



Retired NASA Astronaut Mark Kelly, left, fist pumps his identical twin brother, NASA Astronaut Scott Kelly through glass as Scott Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) participate in a press conference while in quarantine Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. (Photo by /Bill Ingalls/NASA)

Retired NASA Astronaut Mark Kelly, left, fist pumps his identical twin brother, NASA Astronaut Scott Kelly through glass as Scott Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) participate in a press conference while in quarantine Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. Scott Kelly, Kornienko, and Padalka launched to the International Space Station in the Soyuz TMA-16M spacecraft from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time). (Photo by /Bill Ingalls/NASA)



In this handout provided by NASA, the Soyuz TMA-16M spacecraft is seen as it launches to the International Space Station with Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) onboard Saturday, March 28, 2015, Kazakh time (March 27 Eastern time) from the Baikonur Cosmodrome in Kazakhstan. (Photo by Bill Ingalls NASA via Getty Images)

In this handout provided by NASA, the Soyuz TMA-16M spacecraft is seen as it launches to the International Space Station with Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) onboard Saturday, March 28, 2015, Kazakh time (March 27 Eastern time) from the Baikonur Cosmodrome in Kazakhstan. (Photo by Bill Ingalls NASA via Getty Images)



This image made available by NASA via Twitter shows the Cygnus spacecraft approaching the International Space Station on Wednesday, December 9, 2015. At right is the station's robot arm. The capsule brought over 3 tons of cargo. (Photo by Scott Kelly/NASA via AP Photo)

This image made available by NASA via Twitter shows the Cygnus spacecraft approaching the International Space Station on Wednesday, December 9, 2015. At right is the station's robot arm. The capsule brought over 3 tons of cargo. (Photo by Scott Kelly/NASA via AP Photo)



The dancing lights of the Aurora Borealis is shown over the Pacific northwest taken from the International Space Station by astronaut Scott Kelly in this handout provided by NASA, January 20, 2016. (Photo by Scott Kelly/Reuters/ESA/NASA)

The dancing lights of the Aurora Borealis is shown over the Pacific northwest taken from the International Space Station by astronaut Scott Kelly in this handout provided by NASA, January 20, 2016. (Photo by Scott Kelly/Reuters/ESA/NASA)



Astronaut Scott Kelly posted this photo of Australia taken from the International Space Station on Twitter with the caption, “#EarthArt A single pass over the #Australian continent. Picture 16 of 17. #YearInSpace”. (Photo by Scott Kelly/NASA)

Astronaut Scott Kelly posted this photo of Australia taken from the International Space Station on Twitter with the caption, “#EarthArt A single pass over the #Australian continent. Picture 16 of 17. #YearInSpace”. (Photo by Scott Kelly/NASA)



This NASA image released December 22, 2015 shows Expedition 46 Commander Scott Kelly on a December 21, 2015 spacewalk, in which Kelly and Flight Engineer Tim Kopra successfully moved the International Space Station's mobile transporter rail car ahead of Wednesday's docking of a Russian cargo supply spacecraft. After quickly completing their primary objective for the spacewalk, Kelly and Kopra tackled several additional “get-ahead” tasks. Kelly routed a second pair of cables in preparation for International Docking Adapter installment work to support US commercial crew vehicles. (Photo by AFP Photo/NASA)

This NASA image released December 22, 2015 shows Expedition 46 Commander Scott Kelly on a December 21, 2015 spacewalk, in which Kelly and Flight Engineer Tim Kopra successfully moved the International Space Station's mobile transporter rail car ahead of Wednesday's docking of a Russian cargo supply spacecraft. After quickly completing their primary objective for the spacewalk, Kelly and Kopra tackled several additional “get-ahead” tasks. Kelly routed a second pair of cables in preparation for International Docking Adapter installment work to support US commercial crew vehicles. Kopra routed an Ethernet cable that ultimately will connect to a Russian laboratory module. They also retrieved tools that had been in a toolbox on the outside of the station, so they can be used for future work. (Photo by AFP Photo/NASA)



Astronaut Scott Kelly posted this photo taken from the International Space Station October 23, 2015 on Twitter with the caption, “Hurricane #Patricia approaches #Mexico. It's massive. Be careful! #YearInSpace”. (Photo by Scott Kelly/NASA)

Astronaut Scott Kelly posted this photo taken from the International Space Station October 23, 2015 on Twitter with the caption, “Hurricane #Patricia approaches #Mexico. It's massive. Be careful! #YearInSpace”. (Photo by Scott Kelly/NASA)



Astronaut Scott Kelly posted this photo taken from the International Space Station November 5, 2015 on Twitter with the caption, “For an instant before sunrise, the space station glows orange. #GoodMorning from @Space_Station! #YearInSpace”. (Photo by Scott Kelly/NASA)

Astronaut Scott Kelly posted this photo taken from the International Space Station November 5, 2015 on Twitter with the caption, “For an instant before sunrise, the space station glows orange. #GoodMorning from @Space_Station! #YearInSpace”. (Photo by Scott Kelly/NASA)



The Expedition 45 crew gathers inside the Destiny laboratory to celebrate the 15th anniversary of continuous human presence aboard the International Space Station. Front row: Japanese astronaut Kimiya Yui (left) and NASA astronauts Scott Kelly (middle) and Kjell Lindgren. Back row: Russian cosmonauts Sergey Volkov (left), Oleg Kononenko (middle) and Mikhail Kornienko (right). Yui is seen holding the mission patch for Expedition 1 which arrived at the station on November 2, 2000. (Photo by NASA)

The Expedition 45 crew gathers inside the Destiny laboratory to celebrate the 15th anniversary of continuous human presence aboard the International Space Station. Front row: Japanese astronaut Kimiya Yui (left) and NASA astronauts Scott Kelly (middle) and Kjell Lindgren. Back row: Russian cosmonauts Sergey Volkov (left), Oleg Kononenko (middle) and Mikhail Kornienko (right). Yui is seen holding the mission patch for Expedition 1 which arrived at the station on November 2, 2000. (Photo by NASA)



Former astronaut Mark Kelly, left, gives himself a flu shot at the Johnson Space Center in Houston on October 3, 2015 during testing in support of the Twin Studies. The vaccination is part of NASA's study of  identical twin astronauts Scott and Mark Kelly as Scott spends a year aboard the International Space Station and Mark remains on Earth. At right, Scott gives himself a flu shot aboard the space station on Sept. 24. (Photo by NASA)

Former astronaut Mark Kelly, left, gives himself a flu shot at the Johnson Space Center in Houston on October 3, 2015 during testing in support of the Twin Studies. The vaccination is part of NASA's study of identical twin astronauts Scott and Mark Kelly as Scott spends a year aboard the International Space Station and Mark remains on Earth. At right, Scott gives himself a flu shot aboard the space station on Sept. 24. (Photo by NASA)



This image made available by NASA via Twitter posted on Saturday, January 23, 2016, by space station commander Scott Kelly, shows a view from the International Space Station of a storm passing over the United States. A blizzard with hurricane-force winds brought much of the East Coast to a standstill Saturday, dumping snow, stranding travelers and shutting down the nation's capital and its largest city. (Photo by Scott Kelly/NASA via AP Photo)

This image made available by NASA via Twitter posted on Saturday, January 23, 2016, by space station commander Scott Kelly, shows a view from the International Space Station of a storm passing over the United States. A blizzard with hurricane-force winds brought much of the East Coast to a standstill Saturday, dumping snow, stranding travelers and shutting down the nation's capital and its largest city. (Photo by Scott Kelly/NASA via AP Photo)



Expedition 44 flight engineer and NASA astronaut Scott Kelly seen inside the Cupola, a special module which provides a 360-degree viewing of the Earth and the International Space Station. Kelly is one of two crew members spending an entire year in space. (Photo by Scott Kelly/NASA)

Expedition 44 flight engineer and NASA astronaut Scott Kelly seen inside the Cupola, a special module which provides a 360-degree viewing of the Earth and the International Space Station. Kelly is one of two crew members spending an entire year in space. (Photo by Scott Kelly/NASA)



NASA astronaut Scott Kelly is seen while working outside of the International Space Station during a spacewalk on November 6, 2015. Kelly and fellow NASA astronaut Kjell Lindgren restored the port truss (P6) ammonia cooling system to its original configuration and returned ammonia to the desired levels in both the prime and back-up systems. The spacewalk lasted for seven hours and 48 minutes. (Photo by NASA)

NASA astronaut Scott Kelly is seen while working outside of the International Space Station during a spacewalk on November 6, 2015. Kelly and fellow NASA astronaut Kjell Lindgren restored the port truss (P6) ammonia cooling system to its original configuration and returned ammonia to the desired levels in both the prime and back-up systems. The spacewalk lasted for seven hours and 48 minutes. (Photo by NASA)



Astronaut Scott Kelly posted this photo taken from the International Space Station October 13, 2015 on Twitter with the caption, “Day 200. Sometimes a little light makes all the difference. #GoodNight from @Space_Station #YearInSpace”. (Photo by Scott Kelly/NASA)

Astronaut Scott Kelly posted this photo taken from the International Space Station October 13, 2015 on Twitter with the caption, “Day 200. Sometimes a little light makes all the difference. #GoodNight from @Space_Station #YearInSpace”. (Photo by Scott Kelly/NASA)



The Earth view from the cupola onboard the International Space Station. NASA astronaut Scott Kelly tweeted this image with a comment on May 14, 2015: “My first look out the window today”. (Photo by Scott Kelly/NASA)

The Earth view from the cupola onboard the International Space Station. NASA astronaut Scott Kelly tweeted this image with a comment on May 14, 2015: “My first look out the window today”. (Photo by Scott Kelly/NASA)



In this photo provided by NASA and posted on Twitter on October 26, 2015, astronaut Scott Kelly tries on his spacesuit inside the U.S. Quest airlock of the International Space Station. NASA opened its astronaut-application website Monday, Dec. 14, 2015. It's accepting applications through Feb. 18, 2016. (Photo by NASA via AP Photo)

In this photo provided by NASA and posted on Twitter on October 26, 2015, astronaut Scott Kelly tries on his spacesuit inside the U.S. Quest airlock of the International Space Station. NASA opened its astronaut-application website Monday, Dec. 14, 2015. It's accepting applications through Feb. 18, 2016. (Photo by NASA via AP Photo)



Astronaut Scott Kelly posted this photo taken from the International Space Station August 16, 2015 on Twitter with the caption, “Day 142. Weekend is fading, but #Aurora is not. Good night from @space_station! #YearInSpace”. (Photo by Scott Kelly/NASA)

Astronaut Scott Kelly posted this photo taken from the International Space Station August 16, 2015 on Twitter with the caption, “Day 142. Weekend is fading, but #Aurora is not. Good night from @space_station! #YearInSpace”. (Photo by Scott Kelly/NASA)



NASA astronaut Scott Kelly corrals the supply of fresh fruit that arrived on the Kounotori 5 H-II Transfer Vehicle (HTV-5.) Visiting cargo ships often carry a small cache of fresh food for crew members aboard the International Space Station. (Photo by NASA)

NASA astronaut Scott Kelly corrals the supply of fresh fruit that arrived on the Kounotori 5 H-II Transfer Vehicle (HTV-5.) Visiting cargo ships often carry a small cache of fresh food for crew members aboard the International Space Station. (Photo by NASA)



Astronaut Scott Kelly posted this photo taken from the International Space Station on Twitter with the caption, “#EarthArt The color psychology of orange is optimistic. From my view things are looking up down there. #YearInSpace”. (Photo by Scott Kelly/NASA)

Astronaut Scott Kelly posted this photo taken from the International Space Station on Twitter with the caption, “#EarthArt The color psychology of orange is optimistic. From my view things are looking up down there. #YearInSpace”. (Photo by Scott Kelly/NASA)



One-year mission crew members Scott Kelly of NASA (left) and Mikhail Kornienko of Roscosmos (right) celebrated their 300th consecutive day in space on January 21, 2016. The pair will spend a total of 340 days aboard the International Space Station as scientists seek to understand what happens to the human body while in microgravity for extreme lengths of time. (Photo by NASA)

One-year mission crew members Scott Kelly of NASA (left) and Mikhail Kornienko of Roscosmos (right) celebrated their 300th consecutive day in space on January 21, 2016. The pair will spend a total of 340 days aboard the International Space Station as scientists seek to understand what happens to the human body while in microgravity for extreme lengths of time. (Photo by NASA)
25 Feb 2016 12:05:00