
Expedition 19 Commander Gennady I. Padalka answers questions from behind glass during a press conference on Wednesday, March 25, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

PHOTO DATE:11-06-08 LOCATION: NBL SUBJECT: Expedition 19 crew members Mike Barratt and Gennady Padalka during EVA training at the NBL PHOTOGRAPHER: BILL STAFFORD X34753

PHOTO DATE:11-06-08 LOCATION: NBL SUBJECT: Expedition 19 crew members Mike Barratt and Gennady Padalka during EVA training at the NBL PHOTOGRAPHER: BILL STAFFORD X34753

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, center, and Flight Engineer Michael R. Barratt are seen in quarantine behind glass during the State Commission meeting on Wednesday, March 25, 2009 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka, left, and Flight Engineer Michael R. Barratt are seen in quarantine behind glass during the State Commission meeting on Wednesday, March 25, 2009 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka, left, and Flight Engineer Michael R. Barratt answer questions from behind glass during a press conference on Wednesday, March 25, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, center, and Flight Engineer Michael R. Barratt are seen in quarantine behind glass as they pose for photographs on Wednesday, March 25, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, center, and Flight Engineer Michael R. Barratt answer questions from behind glass during a press conference on Wednesday, March 25, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

iss044e005118 (6/26/2015) --- Cosmonaut Gennady Padalka in the U.S. Laboratory in the process of aligning the Observation Analysis of Smectic Islands in Space (OASIS) Macro Camera. The Observation and Analysis of Smectic Islands In Space (OASIS) studies the unique behavior of liquid crystals in microgravity, including their overall motion and the merging of crystal layers known as smectic islands. Liquid crystals are used for display screens in televisions and clocks, and they also occur in soaps and in cell membranes. The experiment allows detailed studies of the behavior of these structures, and how microgravity affects their unique ability to act like both a liquid and a solid crystal.

Expedition 9 Commander Gennady Padalka trains on a Soyuz simulator at the Cosmonaut Hotel, Thursday, April 15, 2004, in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka, plays table tennis at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 32 Russian cosmonaut Sergei Revin, center, is welcomed to Kostanay, Kazakhstan after he and Expedition 32 Commander Gennady Padalka and NASA Flight Engineer Joe Acaba returned from the International Space Station on Monday, Sept. 17, 2012. Revin, Padalka and Padalka returned from five months onboard the International Space Station where they served as members of the Expedition 31 and 32 crews. Photo Credit: (NASA/Carla Cioffi)

Expedition 43 Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) gets his hair cut at the Cosmonaut Hotel, on Wednesday, March 25, 2015, at the Baikonur Cosmodrome in Kazakhstan. Gennady Padalka, NASA Astronaut Scott Kelly, and Russian Cosmonaut Mikhail Kornienko 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 Gennady Padalka of the Russian Federal Space Agency (Roscosmos) gets his hair cut at the Cosmonaut Hotel, on Wednesday, March 25, 2015, at the Baikonur Cosmodrome in Kazakhstan. Gennady Padalka, NASA Astronaut Scott Kelly, and Russian Cosmonaut Mikhail Kornienko 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 Gennady Padalka of the Russian Federal Space Agency (Roscosmos) gets his hair cut at the Cosmonaut Hotel, on Wednesday, March 25, 2015, at the Baikonur Cosmodrome in Kazakhstan. Gennady Padalka, NASA Astronaut Scott Kelly, and Russian Cosmonaut Mikhail Kornienko 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 31 crew members Joe Acaba, left, Commander Gennady Padalka and Sergei Revin, right, receive the traditional blessing by an Orthodox priest at the Cosmonaut Hotel on Tuesday, May 15, 2012 in Baikonur, Kazakhstan. The Soyuz spacecraft with Expedition 31 Soyuz Commander Gennady Padalka, Flight Engineer Sergei Revin, and NASA Flight Engineer Joe Acaba aboard launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit (NASA/Bill Ingalls)

Quarantined Expedition 31 Soyuz Commander Gennady Padalka answers reporters questions from behind glass during a prelaunch press conference held at the Cosmonaut Hotel on Monday, May 14, 2012 in Baikonur, Kazakhstan. The launch of the Soyuz spacecraft with Padalka, Flight Engineer Sergei Revin of Russia, and prime NASA Flight Engineer Joe Acaba is scheduled for 9:01 a.m. local time on Tuesday, May 15. Photo Credit (NASA/Bill Ingalls)

Russian Cosmonaut Gennady Padalka, left, NASA Astronaut Peggy Whitson, center, and Russian Cosmonaut Valery Korzun are seen in traditional Kazakh dress during a ceremony where they were recognized for their achievements in space flight on Thursday, Sept. 23, 2010 in Jhezkazgan, Kazakhstan. Padalka, Whitson, and Korzun were in Jhezkazgan in preparation for the Expedition 24 Soyuz TMA-18 spacecraft landing. Photo Credit: (NASA/Bill Ingalls)

Expedition 31 Soyuz Commander Gennady Padalka continues the traditional of signing one of the doors at the Cosmonaut Hotel on Tuesday, May 15, 2012 in Baikonur, Kazakhstan. The Soyuz spacecraft with Padalka, Flight Engineer Sergei Revin of Russia, and NASA Flight Engineer Joe Acaba aboard launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit (NASA/Bill Ingalls)

A Kazakh singer performs during a ceremony in which NASA Astronaut Peggy Whitson, and Russian Cosmonauts Valery Korzun and Gennady Padalka were recognized for their achievements in space flight on Thursday, Sept. 23, 2010 in Jhezkazgan, Kazakhstan. Whitson, Korzun and Padalka were in Jhezkazgan in preparation for the Expedition 24 Soyuz TMA-18 spacecraft landing. Photo Credit: (NASA/Bill Ingalls)

Expedition 9 Commander Gennady Padalka is carried in a chair from the landing site to the medical tent in order to remove his sokol suit. Padalka landed in the Soyuz capsule along with Expedition 9 Flight Engineer Michael Fincke and Russian Space Forces cosmonaut Yuri Shargin. The crew landed in their Soyuz capsule approximately 85 kilometers northeast of Arkalyk in northern Kazakhstan, Sunday, October 24, 2004. Photo Credit: (NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka is seen through a quarantine windowed room as he and other crew memebers participate in Soyuz rendezvous and docking training at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka, left, and Spaceflight Participant Charles Simonyi exercise at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 9 Commander Gennady Padalka, right, and Flight Engineer and NASA Science Officer Mike Fincke check each other's suits, Monday, April 19, 2004, prior to departing for the launch pad for their liftoff to the International Space Station April 19, 2004 from the Baikonur Cosmodrome in Baikonur, Kazakhstan. Padalka and Fincke launched with European Space Agency Astronaut Andre Kuipers of the Netherlands, who will spend 9 days on the Station, while Padalka and Fincke will remain on board until October. Photo Credit: (NASA/Bill Ingalls)

Expedition 43 NASA Astronaut Scott Kelly, left, talks with Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) during an Soyuz TMA-16M Trajectory and Flight Plan briefing, Thursday, March 19, 2015 at Cosmonaut Hotel in Baikonur, Kazakhstan. Kelly, and Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko 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 31 crew members Joe Acaba, left, Commander Gennady Padalka and Sergei Revin, right, receive the traditional blessing by an Orthodox priest at the Cosmonaut Hotel on Tuesday, May 15, 2012 in Baikonur, Kazakhstan. The Soyuz spacecraft with Expedition 31 Soyuz Commander Gennady Padalka, Flight Engineer Sergei Revin, and NASA Flight Engineer Joe Acaba aboard launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit (NASA/Bill Ingalls)

Expedition 31 crew members Joe Acaba, left, Commander Gennady Padalka and Sergei Revin, right, wave farewell as they depart the Cosmonaut Hotel on Tuesday, May 15, 2012 in Baikonur, Kazakhstan. The Soyuz spacecraft with Expedition 31 Soyuz Commander Gennady Padalka, Flight Engineer Sergei Revin, and NASA Flight Engineer Joe Acaba aboard launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit (NASA/Victor Zelenstov)

Expedition 43 Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) talks with an instructor during an Soyuz TMA-16M Trajectory and Flight Plan briefing, Thursday, March 19, 2015 at Cosmonaut Hotel in Baikonur, Kazakhstan. Padalka, Russian Cosmonaut Mikhail Kornienko of Roscosmos and NASA Astronaut Scott Kelly 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 Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) talks with an instructor during an Soyuz TMA-16M Trajectory and Flight Plan briefing, Thursday, March 19, 2015 at Cosmonaut Hotel in Baikonur, Kazakhstan. Padalka, Russian Cosmonaut Mikhail Kornienko of Roscosmos and NASA Astronaut Scott Kelly 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)

Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) plays badminton during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Padalka, fellow Russian Cosmonaut Mikhail Kornienko of Roscosmos, and 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 20 Commander Gennady Padalka is carried in a chair to the medical tent shortly after he and Spaceflight participant Guy Laliberté, and Expedition 20 Flight Engineer Michael Barratt landed in their Soyuz TMA-14 capsule near the town of Arkalyk, Kazakhstan on Sunday, Oct. 11, 2009. Padalka and Barratt are returning from six months onboard the International Space Station, along with Laliberté who arrived at the station on Oct. 2 with Expedition 21 Flight Engineers Jeff Williams and Maxim Suraev aboard the Soyuz TMA-16 spacecraft. Photo Credit: (NASA/Bill Ingalls)

Gagarin Cosmonaut Training Center (GCTC) Flight Surgeon Alexey Grishin, left, and Russian Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos) play a game of chess during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Padalka, fellow Russian Cosmonaut Mikhail Kornienko of Roscosmos, and 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 31 Soyuz Commander Gennady Padalka smiles after having his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-04M on Tuesday, May 15, 2012 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Padalka, Flight Engineer Sergei Revin, and Expedition 31 Flight Engineer Joe Acaba onboard, launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 NASA flight engineer Joe Acaba, right, and Soyuz Commander Gennady Padalka enter a mockup Soyuz TMA spacecraft in order to perform final qualification tests in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Padalka and flight engineer Sergei Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 NASA flight engineer Joe Acaba, left, Soyuz Commander Gennady Padalka and flight engineer Sergei Revin, third from left, stand at attention before senior officials for their final qualification test in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Padalka and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 NASA flight engineer Joe Acaba, entering capsule, and Soyuz Commander Gennady Padalka enter a mockup Soyuz TMA spacecraft in order to perform final qualification tests in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Padalka and flight engineer Sergei Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 NASA flight engineer Joe Acaba, right, flight engineer Sergei Revin and Soyuz Commander Gennady Padalka enter a mockup Soyuz TMA spacecraft in order to perform final qualification tests in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Revin and Padalka are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 NASA flight engineer Joe Acaba, Soyuz Commander Gennady Padalka and flight engineer Sergei Revin pose for photos before their final qualification test in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Padalka and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 Soyuz Commander Gennady Padalka signs for his Soyuz vehicle simulation test card before senior officials at the Gagarin Cosmonaut Training Center, Tuesday, April 24, 2012 in Star City, Russia, while his fellow crew members NASA flight engineer Joe Acaba, left, and flight engineer Sergei Revin look on. Padalka, Acaba and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 NASA flight engineer Joe Acaba signs for his Soyuz vehicle simulation test card before senior officials at the Gagarin Cosmonaut Training Center, Tuesday, April 24, 2012 in Star City, Russia, while his fellow crew members Soyuz Commander Gennady Padalka, left, and flight engineer Sergei Revin look on. Acaba, Padalka and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 Soyuz Commander Gennady Padalka has his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-04M on Tuesday, May 15, 2012 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Padalka, Flight Engineer Sergei Revin and Flight Engineer Joe Acaba onboard, launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 NASA flight engineer Joe Acaba, left, Soyuz Commander Gennady Padalka and flight engineer Sergei Revin, third from left, stand at attention before senior officials for their final qualification test in preparation for flight, Tuesday, April 24, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Acaba, Padalka and Revin are set to launch to the International Space Station May 15 from the Baikonur Cosmodrome in Kazakhstan. Photo Credit: (NASA/Carla Cioffi)

Expedition 19 Commander Gennady I. Padalka waves hello to members of the media as he and Expedition 19 Flight Engineer Michael R. Barratt and Spaceflight Participant Charles Simonyi prepare to take the elevator to the top of the Soyuz rocket on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Russian Space Forces cosmonaut Yuri Shargin, left, Expedition 9 Commander Gennady Padalka and Expedition 9 Flight Engineer Michael Fincke, right, pose for photos after receiving gifts at a press conference at the airport in Kustanay, Kazakhstan, Sunday, October 24, 2004. Photo Credit: (NASA/Bill Ingalls)

Expedition 29 backup crew members Joseph Acaba, left, and Russian Flight Engineer Gennady Padalka share a few words during a press conference held at the Cosmonaut Hotel in Baikonur, Kazakhstan on Saturday, Nov. 12, 2011. Photo Credit: (NASA/Carla Cioffi)

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, center, and Flight Engineer Michael R. Barratt along with the backup crew and flight doctors walk the grounds of the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka is helped into a seat where his suit will be pressure checked in preparation for his Soyuz launch to the International Space Station with Flight Engineer Michael R. Barratt and Spaceflight Participant Charles Simonyi on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 9 Commander Gennady Padalka, center, and Expedition 9 Flight Engineer Michael Fincke, background, exit the Gargarin Cosmonaut Training Center's airplane to an awaiting crowd of officials and family members after their flight from Kustanay, Kazakhstan, Sunday, October 24, 2004. Photo Credit: (NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka, left, watches as Flight Engineer Michael R. Barratt plants a tree during the traditional tree planting ceremony at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 9 Commander Gennady Padalka, center, trains on a Soyuz simulator while Expedition 9 Flight Engineer and NASA Science Officer Mike Fincke, right, watches at the Cosmonaut Hotel, Thursday, April 15, 2004, in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Members of the media watch as Expedition 19 Commander Gennady I. Padalka, left, and Flight Engineer Michael R. Barratt plant a tree during the traditional tree planting ceremony at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka, left, and Flight Engineer Michael R. Barratt listen to their mp3 players as a medical doctor looks on during the tilt table training at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan.(Photo Credit: NASA/Bill Ingalls)

Expedition 29 backup crew members NASA Flight Engineer Joseph Acaba, far left, Russian Soyuz Commander Gennady Padalka, center, and Russian Flight Engineer Sergei Revin are seen at a press conference held at the Cosmonaut Hotel in Baikonur, Kazakhstan on Saturday, Nov. 12, 2011. Photo Credit: (NASA/Carla Cioffi)

Expedition 9 Commander Gennady Padalka, center, trains on a Soyuz simulator while Expedition 9 Flight Engineer and NASA International Space StationScience Officer Mike Fincke, right, watches at the Cosmonaut Hotel, Thursday, April 15, 2004, in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, Flight Engineer Michael R. Barratt, third from left, backup Expedition 19 flight engineer Maxim Suraev, backup commander Jeffrey Williams and backup spaceflight participant Esther Dyson, far right, answer questions from behind glass during a press conference on Wednesday, March 25, 2009 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Expedition 9 Commander Gennady Padalka smiles after the successful landing in the Soyuz spacecraft with fellow crew members Expedition 9 Flight Engineer Michael Fincke and Russian Space Forces cosmonaut Yuri Shargin. The crew landed in their Soyuz capsule approximately 85 kilometers northeast of Arkalyk in northern Kazakhstan, Sunday, October 24, 2004. Photo Credit: (NASA/Bill Ingalls)

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)

Media document Expedition 43 NASA Astronaut Scott Kelly, seated left, Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) as they work on Soyuz training, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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, left, Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) pose for a group photo near a model of the Soyuz rocket during media day, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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, left, Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) take in the view from a overlook during media day, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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 31 NASA Flight Engineer Joe Acaba, far left, Expedition 31 Soyuz Commander Gennady Padalka and Flight Engineer Sergei Revin, third from left, select International Space Station Russian segment event simulation test cards for their final qualification test in preparation for launch, Monday, April 23, 2012 at the Gagarin Cosmonaut Training Center in Star City, Russia. Padalka, Acaba and Revin are set to launch May 15 from the Baikonur Cosmodrome in their Soyuz TMA-04M spacecraft to the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 43 backup crew member NASA Astronaut Jeff Williams, reflected in mirror, Russian Cosmonauts Mikhail Kornienko, on elliptical, Gennady Padalka of the Russian Federal Space Agency (Roscosmos), and NASA Astronaut Scott Kelly, right, are seen exercising during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Padalka, Kornienko, and 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 NASA Astronaut Scott Kelly, seated left, Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), work on Soyuz training, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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 31 NASA NASA Flight Engineer Joe Acaba signs for his International Space Station Russian segment event simulation test card before senior officials at the Gagarin Cosmonaut Training Center, Monday, April 23, 2012 in Star City, Russia, while his fellow crew members Soyuz commander Gennady Padalka (left) and Sergei Revin look on. Acaba, Padalka and Revin are set to launch May 15 from the Baikonur Cosmodrome in their Soyuz TMA-04M spacecraft to the International Space Station. Photo Credit: (NASA/Carla Cioffi)

Expedition 43 NASA Astronaut Scott Kelly, seated left, Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), work on Soyuz training, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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 Mikhail Kornienko, left, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos), center, and NASA Astronaut Scott Kelly attend a briefing, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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 Mikhail Kornienko, seated left, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos), center, and NASA Astronaut Scott Kelly work on Soyuz training, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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 Mikhail Kornienko, left, and Gennady Padalka of the Russian Federal Space Agency (Roscosmos), center, and NASA Astronaut Scott Kelly attend a briefing, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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)

Media document Expedition 43 NASA Astronaut Scott Kelly, Russian Cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) as they work on Soyuz training, Saturday, March 21, 2015 at the Cosmonaut Hotel 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 (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, left, Russian Cosmonauts Gennady Padalka, 2nd from left, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) attend a Soyuz TMA-16M Trajectory and Flight Plan briefing, Thursday, March 19, 2015 at Cosmonaut Hotel in Baikonur, Kazakhstan. Kelly, Padalka, and Kornienko 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 Cosmonaut Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos), left, NASA Astronaut Scott Kelly, center, and Russian Cosmonaut Gennady Padalka are seen during media day, Saturday, March 21, 2015, Baikonur, Kazakhstan. Kelly, Padalka, and Kornienko 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 31 Flight Engineer Joe Acaba, left, Soyuz Commander Gennady Padalka, and Flight Engineer Sergei Revin, right, don their Russian Sokol suits ahead of their launch onboard the Soyuz TMA-04M on Tuesday, May 15, 2012 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Padalka, Revin, and Acaba onboard, launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 Soyuz Commander Gennady Padalka, left, Flight Engineer Sergei Revin, and Flight Engineer Joe Acaba, right, talk with family members after having their Russian Sokol suits pressure checked in preparation for their launch onboard the Soyuz TMA-04M on Tuesday, May 15, 2012 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Padalka, Revin, and Acaba onboard, launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 Soyuz Commander Gennady Padalka lies in a chair to have his Russian Sokol suit pressure checked in preparation for his launch onboard the Soyuz TMA-04M on Tuesday, May 15, 2012 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Padalka, Flight Engineer Sergei Revin and Flight Engineer Joe Acaba onboard, launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 Soyuz Commander Gennady Padalka, bottom, NASA Flight Engineer Joseph Acaba and Flight Engineer Sergei Revin, top, wave farewell from the base of the Soyuz rocket at the Baikonur Cosmodrome in Kazakhstan, Tuesday, May 15, 2012. The launch of the Soyuz spacecraft with Padalka, Revin, and Acaba is scheduled for 9:01 a.m. local time on Tuesday, May 15. Photo Credit (NASA/Bill Ingalls)

Expedition 32 NASA Flight Engineer Joe Acaba, left, Expedition 32 Commander Gennady Padalka, center, and Flight Engineer Sergei Revin sit in chairs outside the Soyuz Capsule just minutes after they landed in a remote area outside the town of Arkalyk, Kazakhstan, on Monday, Sept. 17, 2012. Acaba, Padalka and Revin are returning from five months onboard the International Space Station where they served as members of the Expedition 31 and 32 crews. Photo Credit: (NASA/Carla Cioffi)

Expedition 31 Soyuz Commander Gennady Padalka, left, and Flight Engineer Sergei Revin talk as technicians assist with donning the Russian Sokol suits ahead of their launch onboard the Soyuz TMA-04M on Tuesday, May 15, 2012 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Padalka, Revin, and Flight Engineer Joe Acaba onboard, launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Expedition 31 Flight Engineer Joe Acaba, left, Soyuz Commander Gennady Padalka, and Flight Engineer Sergei Revin, right, don their Russian Sokol suits ahead of their launch onboard the Soyuz TMA-04M on Tuesday, May 15, 2012 at the Baikonur Cosmodrome in Kazakhstan. The Soyuz spacecraft with Padalka, Revin, and Acaba onboard, launched at 9:01 a.m. Kazakhstan time on Tuesday, May 15. Photo Credit: (NASA/GCTC/Andrey Shelepin)

Spaceflight Participant Charles Simonyi, seated left, Expedition 19 Commander Gennady I. Padalka, seated center, and Flight Engineer Michael R. Barratt don their Russian Sokol suits in preparation for their Soyuz launch to the International Space Station on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Spaceflight Participant Charles Simonyi receives the traditional blessing at the Cosmonaut Hotel on the morning of his Soyuz launch with Expedition 19 Expedition 19 Commander Gennady I. Padalka and Flight Engineer Michael R. Barratt to the International Space Station on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Flight Engineer and NASA Science Officer Mike Fincke, left and Expedition 9 Commander Gennady Padalka pose for a photo during a tour of the Soyuz launch pad, Wednesday, April 14, 2004, 2004 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Flight Engineer and European Space Agency astronaut Andre Kuipers of the Netherlands, left, Expedition 9 Commander Gennady Padalka, center and NASA Science Officer Mike Fincke jog on the grounds of the Cosmonaut Hotel, Friday, April 16, 2004, in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, center, and Flight Engineer Michael R. Barratt don their Russian Sokol suits in preparation for their Soyuz launch to the International Space Station on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka receives the traditional blessing at the Cosmonaut Hotel on the morning of his Soyuz launch with Expedition 19 Flight Engineer Michael R. Barratt and Spaceflight Participant Charles Simonyi to the International Space Station on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 19 Flight Engineer Michael R. Barratt receives the traditional blessing at the Cosmonaut Hotel on the morning of his Soyuz launch with Expedition 19 Commander Gennady I. Padalka and Spaceflight Participant Charles Simonyi to the International Space Station on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 19 Flight Engineer Michael R. Barratt, left, Commander Gennady I. Padalka, center, and Spaceflight Participant Charles Simonyi pose for a photograph after the traditional tree planting ceremony at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

NASA Science Officer Mike Fincke, left and Expedition 9 Commander Gennady Padalka sign books, envelops and mementoes in the space museum located at the Baikonur Cosmodrome, Wednesday, April, 14, 2004, in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

European Space Agency astronaut Andre Kuipers of the Netherlands, left, NASA Science Officer Mike Fincke, center and Expedition 9 Commander Gennady Padalka sign books, envelops and mementos in the space museum located at the Baikonur Cosmodrome, Wednesday, April, 14, 2004, in Baikonur, Kazakhstan. Photo Credit: "NASA/Bill Ingalls"

Expedition 9 Commander Gennady Padalka, Flight Engineer and NASA Science Officer Mike Fincke, center and European Space Agency astronaut Andre Kuipers of the Netherlands take a tour of the Soyuz launch pad, Wednesday, April 14, 2004, in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, center, and Flight Engineer Michael R. Barratt salute officials prior to boarding the bus that will take them to the Soyuz launch pad on Thursday, March 26, 2009 in Baikonur, Kazakhstan. Photo Credit: NASA/Victor Zelentsov)

Flight Engineer and NASA Science Officer Mike Fincke, left, Expedition 9 Commander Gennady Padalka, center and European Space Agency astronaut Andre Kuipers of the Netherlands pose for a photo during a tour of the Soyuz launch pad, Wednesday, April 14, 2004, 2004 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Spaceflight Participant Charles Simonyi, left, Expedition 19 Commander Gennady I. Padalka, center, and Flight Engineer Michael R. Barratt don their Russian Sokol suits in preparation for their Soyuz launch to the International Space Station on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

The Expedition 43 Cosmonaut Gennady Padalka of the Russian Federal Space Agency (Roscosmos), talks with friends and family as he waits for fellow crew mates, NASA Astronaut Scott Kelly, and, Russian Cosmonaut Mikhail Kornienko of Roscosmos, ahead of their departure from the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia for Baikonur, Kazakhstan, Saturday, March 14, 2015. 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, left, Russian Cosmonauts Gennady Padalka, center, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) exit the Gagarin Cosmonaut Training Center (GCTC) aircraft 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)

Expedition 19 Commander Gennady I. Padalka, left, Flight Engineer Michael R. Barratt, right, and Spaceflight Participant Charles Simonyi, 2nd row right, along with cosmonaut instructors are seen through a quarantine windowed room as they participate in Soyuz rendezvous and docking training at the Cosmonaut Hotel, Saturday, March 21, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)

Expedition 9 Commander Gennady Padalka, left, European Space Agency astronaut Andre Kuipers of the Netherlands and Flight Engineer and NASA Science Officer Mike Fincke, right, wave to a crowd from their bus which will take the crew from the Cosmonaut Hotel to the suit up facility, Monday, April 19, 2004, in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

Expedition 19 Commander Gennady I. Padalka performs the traditional door signing at the Cosmonaut Hotel on the morning of his Soyuz launch with Expedition 19 Flight Engineer Michael R. Barratt and Spaceflight Participant Charles Simonyi to the International Space Station on Thursday, March 26, 2009 in Baikonur, Kazakhstan. (Photo Credit: NASA/Bill Ingalls)