Expedition 43 NASA Astronaut Scott Kelly, center, and Expedition 43 backup crew member NASA Astronaut Jeff Williams talk as Kelly’s girlfriend, Amiko Kauderer, looks on at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, Saturday, March 14, 2015. Kelly and fellow Expedition 43 crew members, Russian Cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) departed later in the morning for Baikonur, Kazakhstan. The trio is preparing for launch to the International Space Station in their 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 Credit: (NASA/Bill Ingalls)

Expedition 43 NASA Astronaut Scott Kelly, and girlfriend, Amiko Kauderer, walk with fellow Expedition 43 crew members, family, friends as the crew departs the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, for Baikonur, Kazakhstan, Saturday, March 14, 2015. Kelly and fellow Expedition 43 crew members, Russian Cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are preparing for launch to the International Space Station in their 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 Credit: (NASA/Bill Ingalls)

Expedition 43 NASA Astronaut Scott Kelly's girlfriend, Amiko Kauderer, and Kelly's twin brother, retired NASA Astronaut Mark Kelly, meet with Gagarin Cosmonaut Training Center (GCTC) Chief Epidemiologist Sergei Savin to be medically cleared to visit with Scott 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, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) 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.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 25 Flight Engineer Oleg Skripochka (L), Flight Engineer Alexander Kaleri (c) and NASA’s Scott Kelly answer questions from reporters as they prepare to depart September 25, 2010 for their launch site in Baikonur, Kazakhstan for their launch October 8 in the Soyuz TMA-01M spacecraft to the International Space Station. Credit: NASA/Amiko Kauderer

Soprano Singer Sarah Brightman, scheduled to fly to space later in 2015 as a space tourist, was on hand to wish Expedition 43 NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of Roscosmos, farewell as the crew departed the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, Saturday, March 14, 2015. The Expedition 43 trio is preparing for launch to the International Space Station in their 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 Credit: (NASA/Bill Ingalls)

Expedition 43 NASA Astronaut Scott Kelly, left, and Russian Cosmonauts Mikhail Kornienko, center, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) walk with family and friends as they depart the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, for Baikonur, Kazakhstan, Saturday, March 14, 2015. The trio are preparing for launch to the International Space Station in their 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 Credit: (NASA/Bill Ingalls)

Expedition 43 backup crew members: Jeff Williams of NASA, left, Alexei Ovchinin and Sergei Volkov of of the Russian Federal Space Agency (Roscosmos), pose for a photograph with Expedition 43 prime crew members: NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of Roscosmos, along with loved ones prior to departing the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia, for Baikonur, Kazakhstan, Saturday, March 14, 2015. The Expedition 43 crew is preparing for launch to the International Space Station in the 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 Credit: (NASA/Bill Ingalls)

Family and friends of Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) watch from behind glass as the crew has their Russian sokol suits pressure checked ahead of their launch onboard the Soyuz TMA-16M spacecraft to the International Space Station Friday, March 27, 2015 in Baikonor, Kazakhstan. Kelly, Padalka, and Kornienko launched to the ISS from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Family and friends of Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) watch from behind glass as the crew has their Russian sokol suits pressure checked ahead of their launch onboard the Soyuz TMA-16M spacecraft to the International Space Station Friday, March 27, 2015 in Baikonor, Kazakhstan. Kelly, Padalka, and Kornienko launched to the ISS from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Family and loved ones of Expedition 43 NASA Astronaut Scott Kelly look on as Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), participate in a press conference, Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. 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.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

Family and friends of Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) watch from behind glass as the crew has their Russian sokol suits pressure checked ahead of their launch onboard the Soyuz TMA-16M spacecraft to the International Space Station Friday, March 27, 2015 in Baikonor, Kazakhstan. Kelly, Padalka, and Kornienko launched to the ISS from the Baikonur Cosmodrome in Kazakhstan March 28, Kazakh time (March 27 Eastern time.) As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit: (NASA/GCTC/Andrey Shelepin)