Media photograph the Soyuz TMA-16M spacecraft 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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

The Soyuz TMA-16M spacecraft is seen in this long exposure photograph 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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

Flames from the Soyuz TMA-16M spacecraft are 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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

The service structure arms are seen being lowered in this long exposure photograph less than an hour before the Soyuz TMA-16M spacecraft launched 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. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

Head of Russian Federal Space Agency (Roscosmos) Igor Komarov, left, and NASA Administrator Charles Bolden are seen during an Expedition 43 post launch briefing, Saturday, March 28, 2015 at the Baikonur Hotel in Baikonur, Kazakhstan. Earlier in the morning the Soyuz TMA-16M launched 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 from the Baikonur Cosmodrome in Kazakhstan. 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 prime and backup crews pose for a photograph together in front of St. Basil's Cathedral in Moscow as part of traditional pre-launch ceremonies, from left, Expedition 43 backup crew members; NASA Astronaut Jeff Williams, Russian cosmonaut Sergei Volkov of the Russian Federal Space Agency (Roscosmos), Russian cosmonaut Alexei Ovchinin of Roscosmos, Expedition 43 prime crew members; NASA Astronaut Scott Kelly, Russian cosmonaut Gennady Padalka of Roscosmos, and Russian cosmonaut Mikhail Kornienko of Roscosmos, Friday, March 6, 2015. Kelly, Padalka, and Kornienko 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 prime and backup crews are seen in quarantine behind glass, from left, Expedition 43 prime crew members; NASA Astronaut Scott Kelly, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of Roscosmos, Expedition 43 backup crew members; NASA Astronaut Jeff Williams, Russian cosmonauts Alexei Ovchinin, and Sergei Volkov of Roscosmos during the State Commission meeting to approve the Soyuz launch to the International Space Station, 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)

Expedition 43 prime and backup crews are seen in quarantine behind glass, from left, Expedition 43 prime crew members; NASA Astronaut Scott Kelly, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of Roscosmos, Expedition 43 backup crew members; NASA Astronaut Jeff Williams, Russian cosmonauts Alexei Ovchinin, and Sergei Volkov of Roscosmos during the State Commission meeting to approve the Soyuz launch to the International Space Station, 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)

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 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)

Expedition 43 prime and backup crews are seen in quarantine behind glass during a crew press conference, from left, Expedition 43 prime crew members; NASA Astronaut Scott Kelly, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), Expedition 43 backup crew members; NASA Astronaut Jeff Williams, Russian cosmonauts Alexei Ovchinin, and Sergei Volkov 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)

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 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 their 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)

Expedition 43 prime and backup crews are seen in quarantine behind glass, from left, Expedition 43 prime crew members; NASA Astronaut Scott Kelly, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), Expedition 43 backup crew members; NASA Astronaut Jeff Williams, Russian cosmonauts Alexei Ovchinin, and Sergei Volkov during a crew 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)

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 prime and backup crews arrive at the Cosmonaut Hotel during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Expedition 43 NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

Expedition 43 Russian Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), left, shows his One-Year and Expedition 43 mission patches to members of the press during media day, Saturday, March 21, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Kornienko, NASA Astronaut Scott Kelly, and Russian Cosmonaut Gennady Padalka of Roscosmos are scheduled to launch 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)

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)

Media wait to be escorted to the next event during the Expedition 43 prime and backup crew media day on Saturday, March 21, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 43 NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

Expedition 43 NASA Astronaut Scott Kelly answers questions from the press during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Expedition 43 NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

Expedition 43 Russian Cosmonauts Gennady Padalka, background, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) take part the tilt table training during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Padalka, Kornienko, and Expedition 43 NASA Astronaut Scott Kelly are scheduled to launch 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)

Expedition 43 Russian Cosmonauts Gennady Padalka, left, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) take part the tilt table training during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Padalka, Kornienko, and Expedition 43 NASA Astronaut Scott Kelly are scheduled to launch 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)

Expedition 43 prime and backup crews walk from the Cosmonaut Hotel over to the Zvjozdnyj Hotel for a short break during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Expedition 43 NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

Expedition 43 backup crew member Sergei Volkov of the Russian Federal Space Agency (Roscosmos), left, and Expedition 43 prime crew member Mikhail Kornienko of Roscosmos watch television during a break between classes, Thursday, March 19, 2015 at Cosmonaut Hotel in Baikonur, Kazakhstan. Kornienko and fellow crew members, NASA Astronaut Scott Kelly and Russian Cosmonaut Gennady Padalka of 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 Russian Cosmonauts Gennady Padalka, left, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) take part the tilt table training during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Padalka, Kornienko, and Expedition 43 NASA Astronaut Scott Kelly are scheduled to launch 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)

ISS043E122200 (04/17/2015) --- The SpaceX Dragon cargo spacecraft approaches the International Space Station Apr. 17th, 2015 after launching three days earlier from Cape Canaveral Air Station, Florida. It carries some 2 tons of science experiments, equipment, and supplies for the Expedition 43 team onboard the station.

Expedition 42 Cosmonaut Alexander Samokutyaev of the Russian Federal Space Agency (Roscosmos), center, who returned to Earth from the International Space Station two days earlier, is seen as he comes to say farewell to Expedition 43 crew members; NASA Astronaut Scott Kelly, Russian Cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) at the 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)

ISS035-E-010333 (28 March 2013) --- One of the Expedition 35 crew members aboard the Earth-orbiting International Space Station took this photo which was part of a series documenting the launch of the "other half" of the Expedition 35 crew. The Soyuz TMA-08M rocket launched from the Baikonur Cosmodrome in Kazakhstan on March 29, 2013 (Kazakh time) carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m., March 29, local time, while it was still March 28 in GMT and USA time zones.

ISS035-E-010207 (28 March 2013) --- One of the Expedition 35 crew members aboard the Earth-orbiting International Space Station took this photo which was part of a series documenting the launch of the "other half" of the Expedition 35 crew. The Soyuz TMA-08M rocket launched from the Baikonur Cosmodrome in Kazakhstan on March 29, 2013 (Kazakh time) carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m., March 29, local time, while it was still March 28 in GMT and USA time zones.

ISS035-E-010263 (28 March 2013) --- One of the Expedition 35 crew members aboard the Earth-orbiting International Space Station took this photo which was part of a series documenting the launch of the "other half" of the Expedition 35 crew. The Soyuz TMA-08M rocket launched from the Baikonur Cosmodrome in Kazakhstan on March 29, 2013 (Kazakh time) carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m., March 29, local time, while it was still March 28 in GMT and USA time zones.

ISS035-E-010345 (28 March 2013) --- One of the Expedition 35 crew members aboard the Earth-orbiting International Space Station took this photo which was part of a series documenting the launch of the "other half" of the Expedition 35 crew. The Soyuz TMA-08M rocket launched from the Baikonur Cosmodrome in Kazakhstan on March 29, 2013 (Kazakh time) carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m., March 29, local time, while it was still March 28 in GMT and USA time zones.

ISS035-E-010313 (28 March 2013) --- One of the Expedition 35 crew members aboard the Earth-orbiting International Space Station took this photo which was part of a series documenting the launch of the "other half" of the Expedition 35 crew. The Soyuz TMA-08M rocket launched from the Baikonur Cosmodrome in Kazakhstan on March 29, 2013 (Kazakh time) carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m., March 29, local time, while it was still March 28 in GMT and USA time zones.

ISS035-E-010340 (28 March 2013) --- One of the Expedition 35 crew members aboard the Earth-orbiting International Space Station took this photo which was part of a series documenting the launch of the "other half" of the Expedition 35 crew. The Soyuz TMA-08M rocket launched from the Baikonur Cosmodrome in Kazakhstan on March 29, 2013 (Kazakh time) carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m., March 29, local time, while it was still March 28 in GMT and USA time zones.

ISS035-E-010317 (28 March 2013) --- One of the Expedition 35 crew members aboard the Earth-orbiting International Space Station took this photo which was part of a series documenting the launch of the "other half" of the Expedition 35 crew. The Soyuz TMA-08M rocket launched from the Baikonur Cosmodrome in Kazakhstan on March 29, 2013 (Kazakh time) carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m., March 29, local time, while it was still March 28 in GMT and USA time zones.

Expedition 43 NASA Astronaut Scott Kelly, points to his Expedition 43 crew mission patch after placing it on the the Gagarin Cosmonaut Training Center (GCTC) aircraft during his flight from Star City, Russia, to Baikonur, Kazakhstan, with fellow crew members, Russian Cosmonauts Mikhail Kornienko, center, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos), 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/Victor Zelentsov)

Expedition 43 backup crew members Sergei Volkov, left, and Alexey Ovchinin and of the Russian Federal Space Agency (Roscosmos), center, and NASA Astronaut Jeff Williams attend a training briefing, Saturday, March 21, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 43 prime crew members: NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

Expedition 43 prime crew, left, NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), and Gagarin Cosmonaut Training Center (GCTC) Flight Surgeon Alexey Grishin, head of table, Expedition 43 back up crew members, Sergei Volkov, and Alexey Ovchinin, Roscosmos, and Jeff Williams of NASA enjoy lunch at the Zvjozdnyj Hotel, Thursday, March 19, 2015 in Baikonur, Kazakhstan. Kelly, Padalka, and Kornienko 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 Sergei Volkov, left, and Alexey Ovchinin and of the Russian Federal Space Agency (Roscosmos), center, and NASA Astronaut Jeff Williams attend a training briefing, Saturday, March 21, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 43 prime crew members: NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

Flags depicting the Soyuz TMA-16M spacecraft, the One-Year Mission, and the Expedition 43 Mission are seen on desks in two different rooms separated by glass where Expedition 43 prime and backup crews will meet with space officials on their final check of the Soyuz capsule, Monday, March 23, 2015 at the Baikonur Cosmodrome in Kazakhstan. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

Gagarin Cosmonaut Training Center (GCTC) Chief Epidemiologist Sergei Savin stands in the Cosmonaut Hotel lobby and instructs the media on how their access to the Expedition 43 prime and backup crews will be organized during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Expedition 43 NASA Astronaut Scott Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

6388: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Terry Virts of NASA poses for a picture Nov. 19 by the Soyuz TMA-15M spacecraft during the crew’s second and final pre-launch “fit check” dress rehearsal activities. Virts, Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Samantha Cristoforetti of the European Space Agency will launch on Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Viktor Ivanov

The Soyuz TMA-08M rocket launches from the Baikonur Cosmodrome in Kazakhstan on Friday, March 29, 2013 carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m. local time. Photo Credit: (NASA/Carla Cioffi)

6103: At the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency tests her vestibular system on a tilt table Nov. 18 as part of pre-launch training. Cristoforetti, Terry Virts of NASA and Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) will launch Nov. 24, Kazakh time, from the Baikonur Cosmodrome in the Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Sergei Fyodorov

The Soyuz TMA-08M rocket launches from the Baikonur Cosmodrome in Kazakhstan on Friday, March 29, 2013 carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m. local time. Photo Credit: (NASA/Carla Cioffi)

The Soyuz TMA-08M rocket launches from the Baikonur Cosmodrome in Kazakhstan on Friday, March 29, 2013 carrying Expedition 35 Soyuz Commander Pavel Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin to the International Space Station. Their Soyuz rocket launched at 2:43 a.m. local time. Photo Credit: (NASA/Carla Cioffi)

6374: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmembers Terry Virts of NASA (left), Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) and Samantha Cristoforetti of the European Space Agency (right) pose for pictures Nov. 19 in front of their Soyuz TMA-15M spacecraft during their second and final pre-launch “fit check” dress rehearsal activities. The trio will launch on Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Viktor Ivanov

6443: Inside the Korolev Museum at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency signs a wall mural depicting space milestones including the likeness of Yuri Gagarin, the first human to fly in space, during ceremonial pre-launch activities Nov. 19. Cristoforetti, Terry Virts of NASA and Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) will launch on Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Viktor Ivanov

6394: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency poses for a picture Nov. 19 by the Soyuz TMA-15M spacecraft during the crew’s second and final pre-launch “fit check” dress rehearsal activities. Cristoforetti, Terry Virts of NASA and Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) will launch on Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Viktor Ivanov

Expedition 35 Flight Engineer Alexander Misurkin, left, Soyuz Commander Pavel Vinogradov, right, and Flight Engineer Chris Cassidy, back left, watch a video as the crew bus departs the Cosmonaut Hotel on Thursday, March 28, 2013 in Baikonur, Kazakhstan. The launch of the Soyuz spacecraft with Misurkin, Vinogradov and Cassidy launched at 2:43 a.m. local time on March 29. Photo Credit: (NASA/GCTC/Irina Peshkova)

Expedition 35 Flight Engineers Alexander Misurkin, foreground, and Chris Cassidy watch a video as the crew bus departs the Cosmonaut Hotel on Thursday, March 28, 2013 in Baikonur, Kazakhstan. The launch of the Soyuz spacecraft with Misurkin, Cassidy and Soyuz Commander Pavel Vinogradov launched at 2:43 a.m. local time on March 29. Photo Credit: (NASA/GCTC/Irina Peshkova)

The Soyuz TMA-16M spacecraft is seen after having rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Wednesday, March 25, 2015. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

The Soyuz TMA-16M spacecraft is seen after is was rolled out by train to the launch pad at the Baikonur Cosmodrome, Kazakhstan, Wednesday, March 25, 2015. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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/Victor Zelentsov)

The Soyuz TMA-16M spacecraft is raised into the vertical position shortly after arriving at the launch pad, Wednesday, March 25, 2015, at the Baikonur Cosmodrome, Kazakhstan. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) are scheduled to launch 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)

ISS043E056048 (03/28/2015) --- NASA astronaut Scott Kelly (top right) emerges through the hatch from the Soyuz spacecraft after launching from the Earth earlier to be welcomed by Expedition 43 commander and NASA astronaut Terry Virts aboard the International Space Station on Mar. 28, 2015. Russian cosmonaut Mikhail Kornienko (top left) is next out of the hatch to be welcomed aboard. These two will begin a unique one-year mission on board the station to study longer time frames in space to prepare for the journey to Mars.

6019: At the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, Expedition 42/43 crewmember Terry Virts of NASA tries his hand at darts Nov. 18 as he prepares for launch Nov. 24, Kazakh time, on the Soyuz TMA-15M spacecraft from the Baikonur Cosmodrome. Virts and his crewmates, Soyuz Commander Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Samantha Cristoforetti of the European Space Agency will spend 5 ½ months on the International Space Station. NASA/Sergei Fyodorov

5505: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmembers Terry Virts of NASA (left), Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) and Samantha Cristoforetti of the European Space Agency (right) pose for pictures Nov. 12 in front of their Soyuz TMA-15M spacecraft during a “fit check” dress rehearsal. The trio will launch Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

Expedition 43 NASA Astronaut Scott Kelly dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

5313: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Terry Virts of NASA checks out the systems of the Soyuz TMA-15 spacecraft Nov. 12 during a “fit check” dress rehearsal. Virts, Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Samantha Cristoforetti of the European Space Agency will launch Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

Expedition 43 NASA Astronaut Scott Kelly sits down for a television interview at the Cosmonaut Hotel, Thursday, March 19, 2015 in Baikonur, Kazakhstan. Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko 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)

19-12-04-43: At their Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, Expedition 39/40 Flight Engineer Steve Swanson of NASA (right) and Flight Engineer Oleg Artemyev of the Russian Federal Space Agency (Roscosmos; left) play a game of Ping-Pong March 19 as they prepare for their launch to the International Space Station with their crewmate, Alexander Skvortsov of Roscosmos, on March 26, Kazakh time, in the Soyuz TMA-12M spacecraft for a six-month mission. NASA/Victor Zelentsov

5473: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmembers Terry Virts of NASA (left), Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) and Samantha Cristoforetti of the European Space Agency (right) listen to reporters’ questions Nov. 12 during a “fit check” dress rehearsal. The trio will launch Nov. 24, Kazakh time, from Baikonur in the Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

4108: At the Kremlin Wall in Red Square in Moscow, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency lays flowers Nov. 6 at the site where Russian space icons are interred. Cristoforetti, Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Terry Virts of NASA will launch Nov. 24, Kazakh time from the Baikonur Cosmodrome in Kazakhstan on their Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Stephanie Stoll

Expedition 35 Soyuz Commander Pavel Vinogradov is escorted to the base of the Soyuz rocket on Friday, March 29, 2013 at the Baikonur Cosmodrome in Kazakhstan. Vinogradov, NASA Flight Engineer Chris Cassidy and Russian Flight Engineer Alexander Misurkin will spend five and a half months living and working aboard the International Space Station. Their Soyuz rocket launched at 2:43 a.m. local time. Photo Credit: (NASA/Carla Cioffi)

3779a: At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 42/43 prime crewmembers Terry Virts of NASA (left), Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) and Samantha Cristoforetti of the European Space Agency (right) pose for pictures following a news conference Nov. 6. Virts, Cristoforetti and Shkaplerov will launch Nov. 24, Kazakh time from the Baikonur Cosmodrome in Kazakhstan on their Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Stephanie Stoll

Expedition 43 Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, NASA Astronaut Scott Kelly, and Russian Cosmonaut Mikhail Kornienko Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

5939: At the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, Expedition 42/43 crewmember Terry Virts of NASA (left) tries his hand at billiards Nov. 18 as his Soyuz Commander, Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, right) looks on. Virts, Shkaplerov and Samantha Cristoforetti of the European Space Agency are preparing to launch Nov. 24, Kazakh time, from the Baikonur Cosmodrome in their Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Sergei Fyodorov

Expedition 43 NASA Astronaut Scott Kelly dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

5295: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) climbs into the Soyuz TMA-15M spacecraft during a “fit check” dress rehearsal Nov. 12. Shkaplerov, Samantha Cristoforetti of the European Space Agency and Terry Virts of NASA will launch Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

5347: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmembers Terry Virts of NASA (left), Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) and Samantha Cristoforetti of the European Space Agency (right) pose for pictures Nov. 12 in front of the Soyuz booster to which their Soyuz TMA-15M spacecraft will be mated as part of their “fit check” dress rehearsal. The trio will launch Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

ISS043E055850 (03/27/2015) --- The Soyuz TMA 16M spacecraft approaches the International Space Station after launching 27 Mar. 2015 from the Baikonur Cosmodrome in Kazakhstan . Expedition 43 Russian Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), NASA Astronaut Scott Kelly, and Russian Cosmonaut Gennady Padalka of Roscosmos are onboard and will enter the station after docking.

Expedition 35 Russian Flight Engineer Alexander Misurkin, top, NASA Flight Engineer Chris Cassidy, and Soyuz Commander Pavel Vinogradov, bottom, wave farewell from the base of the Soyuz rocket at the Baikonur Cosmodrome in Baikonur, Kazakhstan, Friday, March 29, 2013. Their Soyuz TMA-08M rocket launched at 2:43 a.m. local time. Photo Credit: (NASA/Carla Cioffi)

4502: At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency (right) answers a reporter’s question Nov. 11 while her crewmates, Terry Virts of NASA (left) and Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) look on. Virts, Shkaplerov and Cristoforetti will launch Nov. 24, Kazakh time from Baikonur in their Soyuz TMA-15M spacecraft for a five and a half month mission on the International Space Station. NASA/Stephanie Stoll

3851: At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency (right) signs a ceremonial book Nov. 6 as her crewmates, Terry Virts of NASA (left) and Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) look on. Virts, Cristoforetti and Shkaplerov will launch Nov. 24, Kazakh time from the Baikonur Cosmodrome in Kazakhstan on their Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Stephanie Stoll

Well wishers welcome Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) after as they arrive in 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/Victor Zelentsov)

Expedition 43 NASA Astronaut Scott Kelly, left, watches as Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) dons his Russian sokol suit ahead of their launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mate, Russian Cosmonaut Mikhail Kornienko Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

6005: At the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, Expedition 42/43 crewmember Terry Virts of NASA (right) tries his hand at Ping-Pong Nov. 18 as his Soyuz Commander, Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, left) looks on. Virts, Shkaplerov and Samantha Cristoforetti of the European Space Agency are preparing to launch Nov. 24, Kazakh time, from the Baikonur Cosmodrome in their Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Sergei Fyodorov

Expedition 43 Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, NASA Astronaut Scott Kelly, and Russian Cosmonaut Mikhail Kornienko Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

5293 copy OK: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency climbs into the Soyuz TMA-15M spacecraft during a “fit check” dress rehearsal Nov. 12. Cristoforetti, Terry Virts of NASA and Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) will launch Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

Expedition 43 NASA Astronaut Scott Kelly, left, Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) are welcomed by officials after arriving in 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/Victor Zelentsov)

14-04-43-5: At the Baikonur Cosmodrome in Kazakhstan, Expedition 40/41 Flight Engineer Reid Wiseman of NASA offers a “thumbs up” as he participates in a dress rehearsal “fit check” May 16 inside the Soyuz TMA-13M spacecraft. Wiseman, Soyuz Commander Max Suraev of the Russian Federal Space Agency (Roscosmos) and Flight Engineer Alexander Gerst of the European Space Agency will launch from Baikonur on May 29, Kazakh time, for a 5 ½ month mission on the International Space Station. NASA/Victor Zelentsov

Expedition 43 NASA Astronaut Scott Kelly dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

Expedition 43 Russian Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), top, NASA Astronaut Scott Kelly, center, and Russian Cosmonaut Gennady Padalka of Roscosmos wave farewell as they board the Soyuz TMA-16M spacecraft ahead of their launch to the International Space Station, Friday, March 27, 2015 in Baikonor, Kazakhstan. As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016. Photo Credit (NASA/Bill Ingalls)

5542: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Samantha Cristoforetti of the European Space Agency climbs into the Soyuz TMA-15M spacecraft during a “fit check” dress rehearsal Nov. 12. Cristoforetti, Terry Virts of NASA and Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) will launch Nov. 24, Kazakh time, from Baikonur for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

Expedition 43 Russian Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, NASA Astronaut Scott Kelly, and Russian Cosmonaut Gennady Padalka of Roscosmos Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

Expedition 43 NASA Astronaut Scott Kelly dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

3981a: At the Gagarin Cosmonaut Training Center in Star City, Russia, Expedition 42/43 crewmember Terry Virts of NASA pauses to look at Russian space memorabilia during a tour of the Gagarin Museum Nov. 6. Virts, Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos) and Samantha Cristoforetti of the European Space Agency will launch Nov. 24, Kazakh time from the Baikonur Cosmodrome in Kazakhstan on their Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Stephanie Stoll

Expedition 43 Russian Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) dons his Russian sokol suit ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew mates, NASA Astronaut Scott Kelly, and Russian Cosmonaut Gennady Padalka of Roscosmos Friday, March 27, 2015 in Baikonor, Kazakhstan. 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)

6255: Behind the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, Expedition 42/43 crewmembers Terry Virts of NASA (left), Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, center) and Samantha Cristoforetti of the European Space Agency (right) pose for pictures Nov. 18 as they near the end of their pre-flight training. Virts, Cristoforetti and Shkaplerov will launch Nov. 24, Kazakh time, from the Baikonur Cosmodrome in the Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Sergei Fyodorov

14-13-43: At the Cosmonaut Hotel crew quarters in Baikonur, Kazakhstan, Expedition 40/41 Flight Engineer Alexander Gerst of the European Space Agency (right) reflects on the planting of a tree bearing his name May 21 in traditional pre-launch ceremonies. Assisting Gerst are Soyuz Commander Max Suraev of the Russian Federal Space Agency (Roscosmos, left) and Flight Engineer Reid Wiseman of NASA (center). Wiseman, Suraev and Gerst will launch on May 29, Kazakh time, on the Soyuz TMA-13M spacecraft from the Baikonur Cosmodrome for a 5 ½ month mission on the International Space Station. NASA/Victor Zelentsov

Expedition 43 NASA Astronaut Scott Kelly is seen as he and his fellow crew members, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) have 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)

Expedition 43 Russian Cosmonauts Gennady Padalka, left, and Mikhail Kornienko talk as fellow crew member NASA Astronaut Scott Kelly has his Russian sokol suit pressure checked for 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/Bill Ingalls)

Expedition 43 NASA Astronaut Scott Kelly adjust his cap as he and his fellow crew members, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) have 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/Bill Ingalls)

Expedition 43 Russian Cosmonaut Gennady Padalka, of the Russian Federal Space Agency (Roscosmos) sits down to have his Russian sokol suit pressure checked ahead of his launch onboard the Soyuz TMA-16M spacecraft to the International Space Station with fellow crew members NASA Astronaut Scott Kelly, and Russian Cosmonaut Mikhail Kornienko 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)

5379: In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 42/43 crewmember Anton Shkaplerov of the Russian Federal Space Agency (Roscosmos, left) undergoes a leak check in his Sokol launch and entry suit Nov. 12 as part of a “fit check” dress rehearsal while crewmate Terry Virts of NASA (right) gestures while waiting his turn. Shkaplerov, Virts and Samantha Cristoforetti of the European Space Agency will launch Nov. 24, Kazakh time, from Baikonur in the Soyuz TMA-15M spacecraft for a 5 ½ month mission on the International Space Station. NASA/Victor Ivanov

Expedition 43 NASA Astronaut Scott Kelly, left, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) talk to family, friends, and officials from behind glass before departing for 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)

Head of Russian Federal Space Agency (Roscosmos) Igor Komarov is seen during the State Commission meeting to approve the Soyuz launch of Expedition 43 to the International Space Station, Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. NASA Astronaut Scott Kelly, and Russian Cosmonauts Mikhail Kornienko, and Gennady Padalka 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)