Mark scott kelly astronaut hi-res stock photography and images

Houston Texas at the Johnson Space Center Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly speak to news media on January 19, 2015 about Scott Kelly's 1-year mission aboard the International Space Station. Scott Joseph Kelly (born February 21, 1964) is an American astronaut, engineer and a retired U.S. Navy Captain. A veteran of three previous missions, Kelly was selected along with Mikhail Korniyenko in November 2012 for a special year-long mission to the International Space Station. Kelly commanded the International Space Station (ISS) on Stock Photo

RMHRP5B5–Houston Texas at the Johnson Space Center Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly speak to news media on January 19, 2015 about Scott Kelly's 1-year mission aboard the International Space Station. Scott Joseph Kelly (born February 21, 1964) is an American astronaut, engineer and a retired U.S. Navy Captain. A veteran of three previous missions, Kelly was selected along with Mikhail Korniyenko in November 2012 for a special year-long mission to the International Space Station. Kelly commanded the International Space Station (ISS) on

NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, speak to reporters about Scott Kelly's upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space. Stock Photo

RMEEWMW2–NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, speak to reporters about Scott Kelly's upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space.

NASA astronaut Scott Kelly and his twin brother, former astronaut Mark Kelly, have both made significant contributions to space exploration, including Scott’s record-breaking year-long mission aboard the ISS. Stock Photo

RMHFA25C–NASA astronaut Scott Kelly and his twin brother, former astronaut Mark Kelly, have both made significant contributions to space exploration, including Scott’s record-breaking year-long mission aboard the ISS.

ISS Expedition 45 commander Astronaut Scott Kelly, right, along with his brother, former Astronaut Mark Kelly stand side by side January 21, 2015 in Houston, Texas. Stock Photo

RMEHC9ED–ISS Expedition 45 commander Astronaut Scott Kelly, right, along with his brother, former Astronaut Mark Kelly stand side by side January 21, 2015 in Houston, Texas.

Photo Date: 10-3-2015 Location: JSC Subject: former astronaut Mark Kelly during his lab testing and flu shot in support of the Twin Studies with his brother Scott Kelly Photographer: Regan Geeseman ISS-45 Mark Kelly flu shot Stock Photo

RMKRK9MC–Photo Date: 10-3-2015 Location: JSC Subject: former astronaut Mark Kelly during his lab testing and flu shot in support of the Twin Studies with his brother Scott Kelly Photographer: Regan Geeseman ISS-45 Mark Kelly flu shot

NASA astronaut Scott Kelly, left, along with his twin brother, former Astronaut Mark Kelly, following a press conference at the Johnson Space Center March 4, 2016 in Houston, Texas. Scott Kelly become the first U.S. astronaut to spend an entire year in space following his return on March 2 from the International Space Station. Stock Photo

RMFNWJB6–NASA astronaut Scott Kelly, left, along with his twin brother, former Astronaut Mark Kelly, following a press conference at the Johnson Space Center March 4, 2016 in Houston, Texas. Scott Kelly become the first U.S. astronaut to spend an entire year in space following his return on March 2 from the International Space Station.

RMKRH9XB–Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly speak to news media outlets about Scott Kelly's 1-year mission aboard the International Space Station. Photo Date: January 19, 2015. Location: Building 2. Photographer: Robert Markowitz Mark and Scott Kelly at the Johnson Space Center, Houston Texas - profile

International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly, left, stands with his identical twin brother former astronaut Mark Kelly at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS. Stock Photo

RMEJJ6YX–International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly, left, stands with his identical twin brother former astronaut Mark Kelly at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS.

Mark Kelly discusses space exploration and his brother Scott Kelly's year-long mission aboard the ISS, with astronaut Terry Virts and National Press Club President John Hughs at a Washington, D.C. event. Stock Photo

RMF6ABFN–Mark Kelly discusses space exploration and his brother Scott Kelly's year-long mission aboard the ISS, with astronaut Terry Virts and National Press Club President John Hughs at a Washington, D.C. event.

NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, right, pose together following Scotts year long mission aboard the International Space Station March 4, 2016 in Houston, Texas. Scott Kelly became the first U.S. astronaut to spend an entire year in space Stock Photo

RMRKBWGH–NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, right, pose together following Scotts year long mission aboard the International Space Station March 4, 2016 in Houston, Texas. Scott Kelly became the first U.S. astronaut to spend an entire year in space

Jan. 21, 2015 - Houston, Texas, United States of America - ISS Expedition 45 commander Astronaut Scott Kelly, right, along with his brother, former Astronaut Mark Kelly stand side by side January 21, 2015 in Houston, Texas. (Credit Image: © Robert Markowitz/Planet Pix via ZUMA Wire) Stock Photo

RM3B2TGEJ–Jan. 21, 2015 - Houston, Texas, United States of America - ISS Expedition 45 commander Astronaut Scott Kelly, right, along with his brother, former Astronaut Mark Kelly stand side by side January 21, 2015 in Houston, Texas. (Credit Image: © Robert Markowitz/Planet Pix via ZUMA Wire)

NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space Stock Photo

RMRKBWGJ–NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space

United States President Barack Obama meets retired NASA astronaut Scott Kelly and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. From left to right: Former NASA astronaut Mark Kelly; Scott Kelly; President Obama; John P. Holdren, Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President’s Council of Advisors on Science and Technology; and Major General Charles Bolden, Jr., (USMC-Retired), NASA Administrator. Credit: Ron Sachs / Pool via CNP /Me Stock Photo

RMRM2N56–United States President Barack Obama meets retired NASA astronaut Scott Kelly and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. From left to right: Former NASA astronaut Mark Kelly; Scott Kelly; President Obama; John P. Holdren, Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President’s Council of Advisors on Science and Technology; and Major General Charles Bolden, Jr., (USMC-Retired), NASA Administrator. Credit: Ron Sachs / Pool via CNP /Me

RMRKWH67–United States President Barack Obama meets retired NASA astronaut Scott Kelly and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. From left to right: Former NASA astronaut Mark Kelly; Scott Kelly; President Obama; John P. Holdren, Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President's Council of Advisors on Science and Technology; and Major General Charles Bolden, Jr., (USMC-Retired), NASA Administrator. Credit: Ron Sachs/Pool via CNP | u

Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly (with mustache) speak to news media outlets about Scott Kelly's one-year mission aboard the International Space Station on January 19, 2015. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) and their international partners. The mission is part of a scientific research project studying long term spaceflight and the effects it has on the human body...NASA Stock Photo

RMW0MP1W–Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly (with mustache) speak to news media outlets about Scott Kelly's one-year mission aboard the International Space Station on January 19, 2015. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) and their international partners. The mission is part of a scientific research project studying long term spaceflight and the effects it has on the human body...NASA

Washington, USA. 07th Dec, 2021. Twin brothers Former Astronaut Scott Kelly, left, and Senator Mark Kelly (D-AZ), right, wait for a train in the Senate Subway at the U.S. Capitol, in Washington, DC, on Tuesday, December 7, 2021. During a hectic week of negotiations on Capitol Hill, President Biden today will speak with Russian President Vladimir Putin about Russian troop build up on the border with Ukraine and the conflict there. (Graeme Sloan/Sipa USA) Credit: Sipa USA/Alamy Live News Stock Photo

RM2H9MPPM–Washington, USA. 07th Dec, 2021. Twin brothers Former Astronaut Scott Kelly, left, and Senator Mark Kelly (D-AZ), right, wait for a train in the Senate Subway at the U.S. Capitol, in Washington, DC, on Tuesday, December 7, 2021. During a hectic week of negotiations on Capitol Hill, President Biden today will speak with Russian President Vladimir Putin about Russian troop build up on the border with Ukraine and the conflict there. (Graeme Sloan/Sipa USA) Credit: Sipa USA/Alamy Live News

New York, United States. 17th Oct, 2016. NYC Comptroller Scott Stringer speaks at the rally. A rally for gun law reform was held on the steps of New York City's City Hall as part of a 42-day, 14-state 'Vocal Majority' bus tour by Americans for Responsible Solutions PAC Co-founders Former Senator Gabby Giffords and former NASA astronaut Mark Kelly accompanied by NYC elected officials and First Lady Chirlaine McCray. Credit: Albin Lohr-Jones/Pacific Press/Alamy Live News Stock Photo

RMH4NAXN–New York, United States. 17th Oct, 2016. NYC Comptroller Scott Stringer speaks at the rally. A rally for gun law reform was held on the steps of New York City's City Hall as part of a 42-day, 14-state 'Vocal Majority' bus tour by Americans for Responsible Solutions PAC Co-founders Former Senator Gabby Giffords and former NASA astronaut Mark Kelly accompanied by NYC elected officials and First Lady Chirlaine McCray. Credit: Albin Lohr-Jones/Pacific Press/Alamy Live News

NASA Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly at the Johnson Space Center, Houston Texas, 2015. Mark and Scott Kelly are identical twins, and will be studied for changes in their health, comparing a body in space to a body on earth. Scott Joseph Kelly (born February 21, 1964) is an American astronaut, engineer and a retired U.S. Navy Captain. A veteran of three previous missions, Kelly was selected along with Mikhail Korniyenko in November 2012 for a special year-long mission to the International Space Station. Kelly commanded the In Stock Photo

RMHRP5AX–NASA Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly at the Johnson Space Center, Houston Texas, 2015. Mark and Scott Kelly are identical twins, and will be studied for changes in their health, comparing a body in space to a body on earth. Scott Joseph Kelly (born February 21, 1964) is an American astronaut, engineer and a retired U.S. Navy Captain. A veteran of three previous missions, Kelly was selected along with Mikhail Korniyenko in November 2012 for a special year-long mission to the International Space Station. Kelly commanded the In

Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly speak to news media outlets about Scott Kelly's 1-year mission aboard the International Space Station. Photo Date: January 19, 2015. Location: Building 2. Photographer: Robert Markowitz Mark and Scott Kelly at the Johnson Space Center, Houston Texas Stock Photo

RMKRH9XA–Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly speak to news media outlets about Scott Kelly's 1-year mission aboard the International Space Station. Photo Date: January 19, 2015. Location: Building 2. Photographer: Robert Markowitz Mark and Scott Kelly at the Johnson Space Center, Houston Texas

NASA astronaut Cady Coleman discusses space exploration with fellow astronauts Terry Virts, Mark Kelly, and Scott Kelly, who was aboard the International Space Station. The discussion took place at the National Press Club, Washington D.C., in 2015. Stock Photo

RMF6ABFP–NASA astronaut Cady Coleman discusses space exploration with fellow astronauts Terry Virts, Mark Kelly, and Scott Kelly, who was aboard the International Space Station. The discussion took place at the National Press Club, Washington D.C., in 2015.

Dr. Jill Biden, wife of Vice President Joe Biden, left, Mark Kelly, former NASA astronaut and Scott Kelly's identical twin, second from left, Dr. John Holdren, director of the White House Office of Science and Technology, third from left, NASA Administrator Charles Bolden, third from right, and Ellen Ochoa, director, NASA's Johnson Space Center, watch as Expedition 46 Commander Scott Kelly of NASA speaks at Ellington Field, Thursday, March 3, 2016 in Houston, Texas after his return to Earth. Kelly and Flight Engineers Mikhail Kornienko and Sergey Volkov of Roscosmos landed in their Soyuz TMA-1 Stock Photo

RMKRMD1P–Dr. Jill Biden, wife of Vice President Joe Biden, left, Mark Kelly, former NASA astronaut and Scott Kelly's identical twin, second from left, Dr. John Holdren, director of the White House Office of Science and Technology, third from left, NASA Administrator Charles Bolden, third from right, and Ellen Ochoa, director, NASA's Johnson Space Center, watch as Expedition 46 Commander Scott Kelly of NASA speaks at Ellington Field, Thursday, March 3, 2016 in Houston, Texas after his return to Earth. Kelly and Flight Engineers Mikhail Kornienko and Sergey Volkov of Roscosmos landed in their Soyuz TMA-1

Retired astronaut Mark Kelly takes a photo of his twin brother, astronaut Scott Kelly, who, along with cosmonauts Gennady Padalka and Mikhail Kornienko, participated in a press conference ahead of the One-Year Mission aboard the International Space Station. Stock Photo

RMEN8GE4–Retired astronaut Mark Kelly takes a photo of his twin brother, astronaut Scott Kelly, who, along with cosmonauts Gennady Padalka and Mikhail Kornienko, participated in a press conference ahead of the One-Year Mission aboard the International Space Station.

RMRKBWGM–NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space

Astronaut Terry Virts met with retired astronaut Mark Kelly and others at the National Press Club in Washington on September 14, 2015. The discussion focused on Scott Kelly’s ongoing year-long mission aboard the International Space Station, highlighting the importance of long-duration spaceflight and astronaut contributions to space research. Stock Photo

RMF6ABFK–Astronaut Terry Virts met with retired astronaut Mark Kelly and others at the National Press Club in Washington on September 14, 2015. The discussion focused on Scott Kelly’s ongoing year-long mission aboard the International Space Station, highlighting the importance of long-duration spaceflight and astronaut contributions to space research.

RM3B2TGE0–Jan. 21, 2015 - Houston, Texas, United States of America - ISS Expedition 45 commander Astronaut Scott Kelly, right, along with his brother, former Astronaut Mark Kelly speak to the media about Scott's upcoming year-long mission aboard the International Space Station January 21, 2015 in Houston, Texas. (Credit Image: © Robert Markowitz/Planet Pix via ZUMA Wire)

RMRM2MHR–United States President Barack Obama meets retired NASA astronaut Scott Kelly and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. From left to right: Former NASA astronaut Mark Kelly; Scott Kelly; President Obama; John P. Holdren, Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President’s Council of Advisors on Science and Technology; and Major General Charles Bolden, Jr., (USMC-Retired), NASA Administrator. Credit: Ron Sachs / Pool via CNP /Me

March 17, 2011 - Houston, TX, United States - NASA International Space Station Expedition 26 astronaut Scott Kelly (left) is reunited with twin brother, astronaut Mark Kelly, after landing the Soyuz TMA-01M spacecraft in Kazakhstan at the Ellington Field Joint Reserve Base March 17, 2010 in Houston, Texas. (Credit Image: © Nasa/Planet Pix via ZUMA Wire) Stock Photo

RM3AY3N6E–March 17, 2011 - Houston, TX, United States - NASA International Space Station Expedition 26 astronaut Scott Kelly (left) is reunited with twin brother, astronaut Mark Kelly, after landing the Soyuz TMA-01M spacecraft in Kazakhstan at the Ellington Field Joint Reserve Base March 17, 2010 in Houston, Texas. (Credit Image: © Nasa/Planet Pix via ZUMA Wire)

RMRKWH3N–United States President Barack Obama meets retired NASA astronaut Scott Kelly and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. From left to right: Former NASA astronaut Mark Kelly; Scott Kelly; President Obama; John P. Holdren, Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President's Council of Advisors on Science and Technology; and Major General Charles Bolden, Jr., (USMC-Retired), NASA Administrator. Credit: Ron Sachs/Pool via CNP | u

January 19, 2015 - Houston, TX, United States of America - NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space (Credit Image: © Robert Markowitz via ZUMA Wire) Stock Photo

RM3C1ANAN–January 19, 2015 - Houston, TX, United States of America - NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space (Credit Image: © Robert Markowitz via ZUMA Wire)

Retired NASA Astronaut Mark Kelly photographs his identical twin brother, NASA Astronaut Scott Kelly, as Scott Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) participate in a press conference on Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. ..Part of NASA's Human Researc Stock Photo

RMW0MP26–Retired NASA Astronaut Mark Kelly photographs his identical twin brother, NASA Astronaut Scott Kelly, as Scott Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) participate in a press conference on Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. ..Part of NASA's Human Researc

RMHRP5B6–NASA Expedition 45/46 Commander, Astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly at the Johnson Space Center, Houston Texas, 2015. Mark and Scott Kelly are identical twins, and will be studied for changes in their health, comparing a body in space to a body on earth. Scott Joseph Kelly (born February 21, 1964) is an American astronaut, engineer and a retired U.S. Navy Captain. A veteran of three previous missions, Kelly was selected along with Mikhail Korniyenko in November 2012 for a special year-long mission to the International Space Station. Kelly commanded the In

RMH4NB08–New York, United States. 17th Oct, 2016. NYC Comptroller Scott Stringer speaks at the rally. A rally for gun law reform was held on the steps of New York City's City Hall as part of a 42-day, 14-state 'Vocal Majority' bus tour by Americans for Responsible Solutions PAC Co-founders Former Senator Gabby Giffords and former NASA astronaut Mark Kelly accompanied by NYC elected officials and First Lady Chirlaine McCray. Credit: Albin Lohr-Jones/Pacific Press/Alamy Live News

RMRKBWGK–NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space

Retired astronaut Mark Kelly participated in a discussion at the National Press Club in Washington on September 14, 2015, alongside fellow astronaut Terry Virts. The conversation focused on space exploration, with a special mention of Mark's twin brother, Scott Kelly, who was approaching the halfway point of his year-long mission aboard the ISS. Stock Photo

RMF6ABFJ–Retired astronaut Mark Kelly participated in a discussion at the National Press Club in Washington on September 14, 2015, alongside fellow astronaut Terry Virts. The conversation focused on space exploration, with a special mention of Mark's twin brother, Scott Kelly, who was approaching the halfway point of his year-long mission aboard the ISS.

ISS Expedition 45 commander Astronaut Scott Kelly, right, along with his brother, former Astronaut Mark Kelly speak to the media about Scott's upcoming year-long mission aboard the International Space Station January 21, 2015 in Houston, Texas. Stock Photo

RMEHC9E3–ISS Expedition 45 commander Astronaut Scott Kelly, right, along with his brother, former Astronaut Mark Kelly speak to the media about Scott's upcoming year-long mission aboard the International Space Station January 21, 2015 in Houston, Texas.

NASA International Space Station Expedition 26 astronaut Scott Kelly (left) is reunited with twin brother, astronaut Mark Kelly, after landing the Soyuz TMA-01M spacecraft in Kazakhstan at the Ellington Field Joint Reserve Base March 17, 2010 in Houston, Texas. Stock Photo

RMH60CRT–NASA International Space Station Expedition 26 astronaut Scott Kelly (left) is reunited with twin brother, astronaut Mark Kelly, after landing the Soyuz TMA-01M spacecraft in Kazakhstan at the Ellington Field Joint Reserve Base March 17, 2010 in Houston, Texas.

United States President Barack Obama, left, meets retired NASA astronaut Scott Kelly, right, and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE - Stock Photo

RMH5YJ8D–United States President Barack Obama, left, meets retired NASA astronaut Scott Kelly, right, and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

Former NASA astronaut Mark Kelly sits with Amiko Kauderer, the girlfriend of his twin brother International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly during a meeting with Gagarin Cosmonaut Training Center Chief Epidemiologist Sergei Savin to be medically cleared to visit with Scott at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Stock Photo

RMEJPKXJ–Former NASA astronaut Mark Kelly sits with Amiko Kauderer, the girlfriend of his twin brother International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly during a meeting with Gagarin Cosmonaut Training Center Chief Epidemiologist Sergei Savin to be medically cleared to visit with Scott at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan.

RM3C1ANC6–January 19, 2015 - Houston, TX, United States of America - NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space (Credit Image: © Robert Markowitz via ZUMA Wire)

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

RMW0MP1X–Retired NASA Astronaut Mark Kelly, left, fist pumps his identical twin brother, NASA Astronaut Scott Kelly through glass as Scott Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) participate in a press conference while in quarantine on March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of Space Shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. .

RMH4NB07–New York, United States. 17th Oct, 2016. NYC Comptroller Scott Stringer speaks at the rally. A rally for gun law reform was held on the steps of New York City's City Hall as part of a 42-day, 14-state 'Vocal Majority' bus tour by Americans for Responsible Solutions PAC Co-founders Former Senator Gabby Giffords and former NASA astronaut Mark Kelly accompanied by NYC elected officials and First Lady Chirlaine McCray. Credit: Albin Lohr-Jones/Pacific Press/Alamy Live News

Astronaut Terry Virts discusses space exploration with retired astronauts Mark and Scott Kelly, reflecting on their experiences aboard the International Space Station and the progress of human spaceflight. Stock Photo

RMF6ABFH–Astronaut Terry Virts discusses space exploration with retired astronauts Mark and Scott Kelly, reflecting on their experiences aboard the International Space Station and the progress of human spaceflight.

United States President Barack Obama makes remarks after meeting with retired NASA astronaut Scott Kelly and his his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE - Stock Photo

RMH5YJ70–United States President Barack Obama makes remarks after meeting with retired NASA astronaut Scott Kelly and his his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly, left, poses with his identical twin brother former astronaut Mark Kelly at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS. Stock Photo

RMEJPKXE–International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly, left, poses with his identical twin brother former astronaut Mark Kelly at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS.

RM3C1AN9K–January 19, 2015 - Houston, TX, United States of America - NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, pose together prior to Scotts upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space (Credit Image: © Robert Markowitz via ZUMA Wire)

Expedition 43 NASA Astronaut Scott Kelly's girlfriend, Amiko Kauderer, and Kelly's twin brother, retired NASA Astronaut Mark Kelly, meet with Gagarin Cosmonaut Training Center (GCTC) Chief Epidemiologist Sergei Savin to be medically cleared to visit with Scott, ON Thursday, March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin, Scott Kelly, is on board the orbiting laboratory. ..Part of NASA's Human Research Pro Stock Photo

RMW0MP20–Expedition 43 NASA Astronaut Scott Kelly's girlfriend, Amiko Kauderer, and Kelly's twin brother, retired NASA Astronaut Mark Kelly, meet with Gagarin Cosmonaut Training Center (GCTC) Chief Epidemiologist Sergei Savin to be medically cleared to visit with Scott, ON Thursday, March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin, Scott Kelly, is on board the orbiting laboratory. ..Part of NASA's Human Research Pro

RMH4NAYJ–New York, United States. 17th Oct, 2016. NYC Comptroller Scott Stringer speaks at the rally. A rally for gun law reform was held on the steps of New York City's City Hall as part of a 42-day, 14-state 'Vocal Majority' bus tour by Americans for Responsible Solutions PAC Co-founders Former Senator Gabby Giffords and former NASA astronaut Mark Kelly accompanied by NYC elected officials and First Lady Chirlaine McCray. Credit: Albin Lohr-Jones/Pacific Press/Alamy Live News

Astronaut Scott Kelly discusses his year-long mission aboard the International Space Station with his twin brother, retired astronaut Mark Kelly, and fellow astronaut Terry Virts at the National Press Club. Stock Photo

RMF6ABFG–Astronaut Scott Kelly discusses his year-long mission aboard the International Space Station with his twin brother, retired astronaut Mark Kelly, and fellow astronaut Terry Virts at the National Press Club.

United States President Barack Obama, right, meets retired NASA astronaut Scott Kelly, center, and his brother Mark, left, in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE - Stock Photo

RMH5YJ72–United States President Barack Obama, right, meets retired NASA astronaut Scott Kelly, center, and his brother Mark, left, in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

Former NASA astronaut Mark Kelly takes a photo of his brother International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly behind glass during the crew press conference at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS. Stock Photo

RMEJPKXH–Former NASA astronaut Mark Kelly takes a photo of his brother International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly behind glass during the crew press conference at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS.

Jan. 19, 2015 - Housteon, TX, United States of America - NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, speak to reporters about Scott Kelly's upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space. (Credit Image: © Robert Markowitz/Planet Pix via ZUMA Wire) Stock Photo

RM3B2TGD0–Jan. 19, 2015 - Housteon, TX, United States of America - NASA astronaut Scott Kelly along with his brother, former Astronaut Mark Kelly, left, speak to reporters about Scott Kelly's upcoming mission aboard the International Space Station as Expedition 45/46 Commander January 19, 2015 in Houston, Texas. Scott Kelly will become the first U.S. astronaut to spend an entire year in space. (Credit Image: © Robert Markowitz/Planet Pix via ZUMA Wire)

NASA astronaut Scott Kelly gives himself a flu shot on September 24, 2015 for an ongoing study on the human immune system. The vaccination is part of NASA's Twins Study, a compilation of multiple investigations that take advantage of a unique opportunity to study identical twin astronauts Scott and Mark Kelly, while Scott spends a year aboard the International Space Station and Mark remains on Earth. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) and t Stock Photo

RMW0MP29–NASA astronaut Scott Kelly gives himself a flu shot on September 24, 2015 for an ongoing study on the human immune system. The vaccination is part of NASA's Twins Study, a compilation of multiple investigations that take advantage of a unique opportunity to study identical twin astronauts Scott and Mark Kelly, while Scott spends a year aboard the International Space Station and Mark remains on Earth. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) and t

April 14, 2010 - Houston, TX, United States of America - NASA astronaut Scott Kelly participates in an Extravehicular Mobility Unit spacesuit fit check in the Space Station Airlock Test Article in the Crew Systems Laboratory at the Johnson Space Center April 14, 2010 in Houston, Texas. (Credit Image: © Mark Sowa/Planet Pix via ZUMA Wire) Stock Photo

RM3B2P2JY–April 14, 2010 - Houston, TX, United States of America - NASA astronaut Scott Kelly participates in an Extravehicular Mobility Unit spacesuit fit check in the Space Station Airlock Test Article in the Crew Systems Laboratory at the Johnson Space Center April 14, 2010 in Houston, Texas. (Credit Image: © Mark Sowa/Planet Pix via ZUMA Wire)

March 26, 2015 - Baikonur, Kazakhstan - Expedition 43 NASA Astronaut Scott Kelly, left, and his identical twin brother Mark Kelly, pose for a photograph Thursday, March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. 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 Soyu Stock Photo

RM3C21MDM–March 26, 2015 - Baikonur, Kazakhstan - Expedition 43 NASA Astronaut Scott Kelly, left, and his identical twin brother Mark Kelly, pose for a photograph Thursday, March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. 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 Soyu

Mark Kelly, retired astronaut, listens to a discussion at the National Press Club in Washington, where his twin brother, Scott Kelly, is currently aboard the International Space Station halfway through his one-year mission. Stock Photo

RMF6ABFM–Mark Kelly, retired astronaut, listens to a discussion at the National Press Club in Washington, where his twin brother, Scott Kelly, is currently aboard the International Space Station halfway through his one-year mission.

RMH5YJ6Y–United States President Barack Obama makes remarks after meeting with retired NASA astronaut Scott Kelly and his his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly waves to his identical twin brother former NASA astronaut Mark Kelly behind glass during the crew press conference at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS. Stock Photo

RMEJPKXW–International Space Station Expedition 43 Commander NASA Astronaut Scott Kelly waves to his identical twin brother former NASA astronaut Mark Kelly behind glass during the crew press conference at the Cosmonaut Hotel March 26, 2015 in Baikonur, Kazakhstan. Kelly and cosmonauts Mikhail Kornienko and Gennady Padalka launch in their Soyuz TMA-16M spacecraft on March 28 for a year long mission onboard the ISS.

Expedition 43 NASA astronaut Scott Kelly shows his support for his twin brother former astronaut Mark Kelly as he appears on Celebrity Jeopardy game show as he watches from aboard the International Space Station May 15, 2015 in Earth Orbit. Stock Photo

RMEPYNC0–Expedition 43 NASA astronaut Scott Kelly shows his support for his twin brother former astronaut Mark Kelly as he appears on Celebrity Jeopardy game show as he watches from aboard the International Space Station May 15, 2015 in Earth Orbit.

Former NASA astronaut Mark Kelly gives himself a flu shot on October 3, 2015 for an ongoing study on the human immune system. The vaccination is part of NASA's Twins Study, a compilation of multiple investigations that take advantage of a unique opportunity to study identical twin astronauts Scott and Mark Kelly, while Scott spends a year aboard the International Space Station and Mark remains on Earth. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) an Stock Photo

RMW0MP24–Former NASA astronaut Mark Kelly gives himself a flu shot on October 3, 2015 for an ongoing study on the human immune system. The vaccination is part of NASA's Twins Study, a compilation of multiple investigations that take advantage of a unique opportunity to study identical twin astronauts Scott and Mark Kelly, while Scott spends a year aboard the International Space Station and Mark remains on Earth. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) an

NASA astronauts Scott Kelly (left) and identical twin brother Mark Kelly during check-out at Ellington Field Johnson Space Center May 6, 2008 in Houston, Texas. Stock Photo

RMFK371C–NASA astronauts Scott Kelly (left) and identical twin brother Mark Kelly during check-out at Ellington Field Johnson Space Center May 6, 2008 in Houston, Texas.

RM3C21MDC–March 26, 2015 - Baikonur, Kazakhstan - Expedition 43 NASA Astronaut Scott Kelly, left, and his identical twin brother Mark Kelly, pose for a photograph Thursday, March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. 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 Soyu

NASA astronauts Scott Kelly (left), Expedition 25 flight engineer and Expedition 26 commander and identical twin brother Mark Kelly, STS-134 commander during emergency scenarios training session in the Space Vehicle Mock-up Facility at Johnson Space Center July 16, 2010 in Houston, Texas. Stock Photo

RMFK371B–NASA astronauts Scott Kelly (left), Expedition 25 flight engineer and Expedition 26 commander and identical twin brother Mark Kelly, STS-134 commander during emergency scenarios training session in the Space Vehicle Mock-up Facility at Johnson Space Center July 16, 2010 in Houston, Texas.

September 14, 2015 - Washington, DC, USA - Astronaut Scott Kelly talks live from onboard the International Space Station during a discussion with Astronaut Terry Virts, and Kelly's twin brother retired Astronaut Mark Kelly, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com) Stock Photo

RM3C21ME7–September 14, 2015 - Washington, DC, USA - Astronaut Scott Kelly talks live from onboard the International Space Station during a discussion with Astronaut Terry Virts, and Kelly's twin brother retired Astronaut Mark Kelly, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com)

NASA retired Astronaut Mark Kelly talks during a discussion at the National Press Club with a satellite uplink to his twin bother, Scott Kelly who is currently onboard the International Space Station September 14, 2015 in Washington, DC. Stock Photo

RMF2B3PE–NASA retired Astronaut Mark Kelly talks during a discussion at the National Press Club with a satellite uplink to his twin bother, Scott Kelly who is currently onboard the International Space Station September 14, 2015 in Washington, DC.

Houston, USA. 03rd Mar, 2016. American astronaut and Expedition 46 Commander Scott Kelly of NASA is welcomed home on arrival at Ellington Field March 3, 2016 in Houston, Texas. Welcoming Kelly are: (R-L) Dr. Jill Biden, wife of Vice President Joe Biden Mark Kelly, Dr. John Holdren, director of the White House Office of Science and Technology, NASA Administrator Charles Bolden. Stock Photo

RMFJPG7K–Houston, USA. 03rd Mar, 2016. American astronaut and Expedition 46 Commander Scott Kelly of NASA is welcomed home on arrival at Ellington Field March 3, 2016 in Houston, Texas. Welcoming Kelly are: (R-L) Dr. Jill Biden, wife of Vice President Joe Biden Mark Kelly, Dr. John Holdren, director of the White House Office of Science and Technology, NASA Administrator Charles Bolden.

Astronaut Scott Kelly participates in a live discussion from the International Space Station with his twin brother, retired astronaut Mark Kelly, and astronaut Terry Virts, marking halfway through his one-year mission in space. Stock Photo

RMF6ABFF–Astronaut Scott Kelly participates in a live discussion from the International Space Station with his twin brother, retired astronaut Mark Kelly, and astronaut Terry Virts, marking halfway through his one-year mission in space.

NASA astronaut Scott Kelly and his twin brother Mark Kelly pose before launching to the International Space Station for a one-year mission, along with cosmonauts Mikhail Kornienko and Gennady Padalka, from Baikonur Cosmodrome in Kazakhstan. Stock Photo

RMEN8FBX–NASA astronaut Scott Kelly and his twin brother Mark Kelly pose before launching to the International Space Station for a one-year mission, along with cosmonauts Mikhail Kornienko and Gennady Padalka, from Baikonur Cosmodrome in Kazakhstan.

ESA astronaut Samantha Cristoforetti joins astronauts Terry Virts, Mark Kelly, and Scott Kelly for a discussion at the National Press Club, marking Scott Kelly’s halfway point in his one-year mission aboard the International Space Station. Stock Photo

RMF6ABFB–ESA astronaut Samantha Cristoforetti joins astronauts Terry Virts, Mark Kelly, and Scott Kelly for a discussion at the National Press Club, marking Scott Kelly’s halfway point in his one-year mission aboard the International Space Station.

RMH5YJ7X–United States President Barack Obama makes remarks after meeting with retired NASA astronaut Scott Kelly and his his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

NASA astronaut Mark Kelly and Dr. Jill Biden visited NASA's Johnson Space Center to engage with students about robotics. The visit followed Scott Kelly's return after a year in space on the International Space Station, highlighting NASA's educational outreach and astronaut achievements. Stock Photo

RMFT0NT0–NASA astronaut Mark Kelly and Dr. Jill Biden visited NASA's Johnson Space Center to engage with students about robotics. The visit followed Scott Kelly's return after a year in space on the International Space Station, highlighting NASA's educational outreach and astronaut achievements.

NASA Astronaut Scott Kelly and his twin brother Mark Kelly pose at the Cosmonaut Hotel in Baikonur, Kazakhstan, before launching to the International Space Station in 2015. The launch was part of the Expedition 43 mission, which involved a one-year stay for Kelly and cosmonaut Mikhail Kornienko. They returned to Earth in March 2016. Stock Photo

RMEN8FC1–NASA Astronaut Scott Kelly and his twin brother Mark Kelly pose at the Cosmonaut Hotel in Baikonur, Kazakhstan, before launching to the International Space Station in 2015. The launch was part of the Expedition 43 mission, which involved a one-year stay for Kelly and cosmonaut Mikhail Kornienko. They returned to Earth in March 2016.

Expedition 43 NASA astronaut Scott Kelly, left, and his identical twin brother Mark Kelly, pose for a photograph on March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin, Scott Kelly, is on board the orbiting laboratory. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) and Stock Photo

RMW0MP22–Expedition 43 NASA astronaut Scott Kelly, left, and his identical twin brother Mark Kelly, pose for a photograph on March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin, Scott Kelly, is on board the orbiting laboratory. ..Part of NASA's Human Research Program, the One-Year Mission on the International Space Station is a joint effort between the U.S. space agency, the Russian Federal Space Agency (Roscosmos) and

Astronaut Terry Virts participated in a discussion with retired astronaut Mark Kelly and his twin brother, Scott Kelly, on September 14, 2015. This event took place at the National Press Club in Washington, D.C., a day before Scott Kelly reached the halfway point of his year-long mission aboard the International Space Station. Stock Photo

RMF6ABFE–Astronaut Terry Virts participated in a discussion with retired astronaut Mark Kelly and his twin brother, Scott Kelly, on September 14, 2015. This event took place at the National Press Club in Washington, D.C., a day before Scott Kelly reached the halfway point of his year-long mission aboard the International Space Station.

RMW0M30P–Dr. Jill Biden, wife of Vice President Joe Biden, left, Mark Kelly, former NASA astronaut and Scott Kelly's identical twin, second from left, Dr. John Holdren, director of the White House Office of Science and Technology, third from left, NASA Administrator Charles Bolden, third from right, and Ellen Ochoa, director, NASA's Johnson Space Center, watch as Expedition 46 Commander Scott Kelly of NASA speaks at Ellington Field, Thursday, March 3, 2016 in Houston, Texas after his return to Earth. Kelly and Flight Engineers Mikhail Kornienko and Sergey Volkov of Roscosmos landed in their Soyuz TMA-1

Astronaut Scott Kelly's girlfriend, Amiko Kauderer, and his twin brother, retired astronaut Mark Kelly, met with Sergei Savin, Chief Epidemiologist of the Gagarin Cosmonaut Training Center, to be medically cleared for visiting Scott Kelly in Baikonur, Kazakhstan, as part of NASA's Expedition 43 mission. Mark Kelly will participate in biomedical studies during his twin’s one-year space mission aboard the International Space Station. Stock Photo

RMEN8GBR–Astronaut Scott Kelly's girlfriend, Amiko Kauderer, and his twin brother, retired astronaut Mark Kelly, met with Sergei Savin, Chief Epidemiologist of the Gagarin Cosmonaut Training Center, to be medically cleared for visiting Scott Kelly in Baikonur, Kazakhstan, as part of NASA's Expedition 43 mission. Mark Kelly will participate in biomedical studies during his twin’s one-year space mission aboard the International Space Station.

September 14, 2015 - Washington, DC, USA - Retired Astronaut Mark Kelly talks during a discussion with Astronaut Terry Virts, National Press Club President John Hughs, and Kelly's twin bother, Scott Kelly who is currently onboard the International Space Station, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com) Stock Photo

RM3C21ME5–September 14, 2015 - Washington, DC, USA - Retired Astronaut Mark Kelly talks during a discussion with Astronaut Terry Virts, National Press Club President John Hughs, and Kelly's twin bother, Scott Kelly who is currently onboard the International Space Station, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com)

Dr. Jill Biden, accompanied by NASA's Ellen Ochoa and astronaut Mark Kelly, welcomes home astronaut Scott Kelly after his year-long mission aboard the International Space Station. Stock Photo

RMFT0NPD–Dr. Jill Biden, accompanied by NASA's Ellen Ochoa and astronaut Mark Kelly, welcomes home astronaut Scott Kelly after his year-long mission aboard the International Space Station.

Houston, USA. 03rd Mar, 2016. NASA Administrator Charles Bolden welcomes astronaut and Expedition 46 Commander Scott Kelly of NASA on arrival at Ellington Field March 3, 2016 in Houston, Texas. Standing behind Boden are: (L-R) Dr. Jill Biden, wife of Vice President Joe Biden Mark Kelly, former NASA astronaut and Scott Kelly's identical twin, Dr. John Holdren, director of the White House Office of Science. Stock Photo

RMFJPG62–Houston, USA. 03rd Mar, 2016. NASA Administrator Charles Bolden welcomes astronaut and Expedition 46 Commander Scott Kelly of NASA on arrival at Ellington Field March 3, 2016 in Houston, Texas. Standing behind Boden are: (L-R) Dr. Jill Biden, wife of Vice President Joe Biden Mark Kelly, former NASA astronaut and Scott Kelly's identical twin, Dr. John Holdren, director of the White House Office of Science.

Astronauts Terry Virts and Mark Kelly, along with Scott Kelly, discuss space exploration and Scott's one-year mission aboard the ISS. The event was held at the National Press Club in Washington, D.C. Stock Photo

RMF6ABF9–Astronauts Terry Virts and Mark Kelly, along with Scott Kelly, discuss space exploration and Scott's one-year mission aboard the ISS. The event was held at the National Press Club in Washington, D.C.

Mark and Scott Kelly, identical twin NASA astronauts, share a moment during a press conference at Baikonur Cosmodrome before Scott embarks on the one-year mission aboard the International Space Station. Stock Photo

RMEN8GEA–Mark and Scott Kelly, identical twin NASA astronauts, share a moment during a press conference at Baikonur Cosmodrome before Scott embarks on the one-year mission aboard the International Space Station.

Dr. Jill Biden, Mark Kelly, Dr. John Holdren, and NASA Administrator Charles Bolden watch as Expedition 46 Commander Scott Kelly discusses his year-long mission in space after returning to Earth at Ellington Field. Stock Photo

RMFT0NTD–Dr. Jill Biden, Mark Kelly, Dr. John Holdren, and NASA Administrator Charles Bolden watch as Expedition 46 Commander Scott Kelly discusses his year-long mission in space after returning to Earth at Ellington Field.

Astronaut Scott Kelly speaks from the International Space Station during a live discussion at the National Press Club, marking the halfway point of his one-year mission in space. The event also includes insights from astronaut Terry Virts and his twin brother Mark Kelly. Stock Photo

RMF6ABFA–Astronaut Scott Kelly speaks from the International Space Station during a live discussion at the National Press Club, marking the halfway point of his one-year mission in space. The event also includes insights from astronaut Terry Virts and his twin brother Mark Kelly.

NASA's Mark Geyer discusses the Orion space capsule with Dr. Jill Biden at the Space Vehicle Mockup Facility. The event occurred as part of a visit to welcome astronaut Scott Kelly home after his year-long mission aboard the International Space Station. Stock Photo

RMFT0NT4–NASA's Mark Geyer discusses the Orion space capsule with Dr. Jill Biden at the Space Vehicle Mockup Facility. The event occurred as part of a visit to welcome astronaut Scott Kelly home after his year-long mission aboard the International Space Station.

NASA astronaut Scott Kelly, left, shakes hands with United States President Barack Obama, right, following a meeting with Scott and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE - Stock Photo

RMH5YJ8E–NASA astronaut Scott Kelly, left, shakes hands with United States President Barack Obama, right, following a meeting with Scott and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

Actor Matt Damon, starring as Mark Watney in 'The Martian,' discusses Mars exploration with NASA astronauts aboard the ISS, while also meeting NASA consultants who advised on the film’s technical accuracy regarding Mars and space exploration. Stock Photo

RMF6AHMY–Actor Matt Damon, starring as Mark Watney in 'The Martian,' discusses Mars exploration with NASA astronauts aboard the ISS, while also meeting NASA consultants who advised on the film’s technical accuracy regarding Mars and space exploration.

Dr. John Holdren, director of the White House Office of Science and Technology Policy, left, Jackie Bolden, second from left, NASA Administrator Charles Bolden, third from left, Mark Kelly, former NASA astronaut and Scott Kelly's identical twin brother, fifth from left, Kelly Pysh, Aberdeen High School in Aberdeen, Maryland, fourth from right, Sara Decker, a junior at Aberdeen High School, third from right, Brandon Casquete, a sophomore at Aberdeen High School, second from right, and Dr. Jill Biden, wife of Vice President Joe Biden, right, listen to Norm Knight, chief, Flight Director Office Stock Photo

RMFT0NPT–Dr. John Holdren, director of the White House Office of Science and Technology Policy, left, Jackie Bolden, second from left, NASA Administrator Charles Bolden, third from left, Mark Kelly, former NASA astronaut and Scott Kelly's identical twin brother, fifth from left, Kelly Pysh, Aberdeen High School in Aberdeen, Maryland, fourth from right, Sara Decker, a junior at Aberdeen High School, third from right, Brandon Casquete, a sophomore at Aberdeen High School, second from right, and Dr. Jill Biden, wife of Vice President Joe Biden, right, listen to Norm Knight, chief, Flight Director Office

September 14, 2015 - Washington, DC, USA - Retired Astronaut Mark Kelly listens during a discussion with Astronaut Terry Virts, right, National Press Club President John Hughs, and Kelly's twin bother, Scott Kelly who is currently onboard the International Space Station, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com) Stock Photo

RM3C21MF3–September 14, 2015 - Washington, DC, USA - Retired Astronaut Mark Kelly listens during a discussion with Astronaut Terry Virts, right, National Press Club President John Hughs, and Kelly's twin bother, Scott Kelly who is currently onboard the International Space Station, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com)

Houston, USA. 03rd Mar, 2016. American astronaut and Expedition 46 Commander Scott Kelly of NASA speaks after being welcomed home on arrival at Ellington Field March 3, 2016 in Houston, Texas. Standing behind Kelly are: (L-R) Dr. Jill Biden, wife of Vice President Joe Biden Mark Kelly, former NASA astronaut and Scott Kelly's identical twin, Dr. John Holdren, director of the White House Office of Science and Technology, NASA Administrator Charles Bolden and Ellen Ochoa, director, NASA's Johnson Space Center. Stock Photo

RMFJPG6T–Houston, USA. 03rd Mar, 2016. American astronaut and Expedition 46 Commander Scott Kelly of NASA speaks after being welcomed home on arrival at Ellington Field March 3, 2016 in Houston, Texas. Standing behind Kelly are: (L-R) Dr. Jill Biden, wife of Vice President Joe Biden Mark Kelly, former NASA astronaut and Scott Kelly's identical twin, Dr. John Holdren, director of the White House Office of Science and Technology, NASA Administrator Charles Bolden and Ellen Ochoa, director, NASA's Johnson Space Center.

Former President George H.W. Bush, right, with former astronaut Mark Kelly as they speak with twin brother Expedition 46 Commander Scott Kelly and Flight Engineer Tim Kopra currently on the International Space Station from the Flight Control Room during a visit to the Johnson Space Center February 5, 2016 in Houston, Texas. Stock Photo

RMFF4EJX–Former President George H.W. Bush, right, with former astronaut Mark Kelly as they speak with twin brother Expedition 46 Commander Scott Kelly and Flight Engineer Tim Kopra currently on the International Space Station from the Flight Control Room during a visit to the Johnson Space Center February 5, 2016 in Houston, Texas.

NASA astronaut Scott Kelly, left, makes remarks as United States President Barack Obama, right, looks on following a meeting with Scott and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE - Stock Photo

RMH5YJ77–NASA astronaut Scott Kelly, left, makes remarks as United States President Barack Obama, right, looks on following a meeting with Scott and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

September 14, 2015 - Washington, DC, USA - Astronaut Terry Virts, right, is seen during a discussion with retired Astronaut Mark Kelly, center, National Press Club President John Hughs, and Kelly's twin bother, Scott Kelly who is currently onboard the International Space Station, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com) Stock Photo

RM3C21MFE–September 14, 2015 - Washington, DC, USA - Astronaut Terry Virts, right, is seen during a discussion with retired Astronaut Mark Kelly, center, National Press Club President John Hughs, and Kelly's twin bother, Scott Kelly who is currently onboard the International Space Station, Monday, Sept. 14, 2015 at the National Press Club in Washington. The discussion is a day before Scott Kelly reaches halfway through his one year in space. (Credit Image: © NASA/ZUMA Wire/ZUMAPRESS.com)

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

RM3C21RYG–March 26, 2015 - Baikonur, Kazakhstan - Retired NASA Astronaut Mark Kelly photographs his identical twin brother, NASA Astronaut Scott Kelly, as Scott Kelly and fellow crew mates, Russian cosmonauts Gennady Padalka, and Mikhail Kornienko of the Russian Federal Space Agency (Roscosmos) participate in a press conference, Thursday, March 26, 2015, at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting labo

RMH5YJ73–NASA astronaut Scott Kelly, left, makes remarks as United States President Barack Obama, right, looks on following a meeting with Scott and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. Credit: Ron Sachs/Pool via CNP - NO WIRE SERVICE -

March 26, 2015 - Baikonur, Kazakhstan - Expedition 43 NASA Astronaut Scott Kelly's girlfriend, Amiko Kauderer, and Kelly's twin brother, retired NASA Astronaut Mark Kelly, meet with Gagarin Cosmonaut Training Center (GCTC) Chief Epidemiologist Sergei Savin to be medically cleared to visit with Scott Thursday, March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. Scott Kelly, Stock Photo

RM3C21MCX–March 26, 2015 - Baikonur, Kazakhstan - Expedition 43 NASA Astronaut Scott Kelly's girlfriend, Amiko Kauderer, and Kelly's twin brother, retired NASA Astronaut Mark Kelly, meet with Gagarin Cosmonaut Training Center (GCTC) Chief Epidemiologist Sergei Savin to be medically cleared to visit with Scott Thursday, March 26, 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Mark Kelly, who flew four space shuttle missions and commanded the final flight of space shuttle Endeavour, will participate in biomedical studies on the ground while his twin is on board the orbiting laboratory. Scott Kelly,

THE BROOKLYN BOROUGH OF NEW YORK Brooklyn, NY - FEBRUARY 22: Mark Kelly, Scott Kelly attends Breitling Celebrates The North American Stopover of its Global Roadshow at Duggal Greenhouse on February 22, 2018 in the Brooklyn borough of New York City, New York. ...People: Mark Kelly, Scott Kelly. (Credit Image: © SMG via ZUMA Wire) Stock Photo

RM3AAY33P–THE BROOKLYN BOROUGH OF NEW YORK Brooklyn, NY - FEBRUARY 22: Mark Kelly, Scott Kelly attends Breitling Celebrates The North American Stopover of its Global Roadshow at Duggal Greenhouse on February 22, 2018 in the Brooklyn borough of New York City, New York. ...People: Mark Kelly, Scott Kelly. (Credit Image: © SMG via ZUMA Wire)

RMH5YJ6R–United States President Barack Obama meets retired NASA astronaut Scott Kelly and his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016. From left to right: Former NASA astronaut Mark Kelly; Scott Kelly; President Obama; John P. Holdren, Assistant to the President for Science and Technology, Director of the White House Office of Science and Technology Policy, and Co-Chair of the President·s Council of Advisors on Science and Technology; and Major General Charles Bolden, Jr., (USMC-Retired), NASA Administrator. Credit: Ron Sachs/Pool via CNP - N

RM3AAY348–THE BROOKLYN BOROUGH OF NEW YORK Brooklyn, NY - FEBRUARY 22: Mark Kelly, Scott Kelly attends Breitling Celebrates The North American Stopover of its Global Roadshow at Duggal Greenhouse on February 22, 2018 in the Brooklyn borough of New York City, New York. ...People: Mark Kelly, Scott Kelly. (Credit Image: © SMG via ZUMA Wire)

RM3AAY7PW–THE BROOKLYN BOROUGH OF NEW YORK Brooklyn, NY - FEBRUARY 22: Mark Kelly, Scott Kelly attends Breitling Celebrates The North American Stopover of its Global Roadshow at Duggal Greenhouse on February 22, 2018 in the Brooklyn borough of New York City, New York. ...People: Mark Kelly, Scott Kelly. (Credit Image: © SMG via ZUMA Wire)

July 16, 2010 - Houston, TX, United States of America - NASA astronauts Scott Kelly (left), Expedition 25 flight engineer and Expedition 26 commander and identical twin brother Mark Kelly, STS-134 commander during emergency scenarios training session in the Space Vehicle Mock-up Facility at Johnson Space Center July 16, 2010 in Houston, Texas. (Credit Image: © Mark Sowa/Planet Pix via ZUMA Wire) Stock Photo

RM3B2P2PD–July 16, 2010 - Houston, TX, United States of America - NASA astronauts Scott Kelly (left), Expedition 25 flight engineer and Expedition 26 commander and identical twin brother Mark Kelly, STS-134 commander during emergency scenarios training session in the Space Vehicle Mock-up Facility at Johnson Space Center July 16, 2010 in Houston, Texas. (Credit Image: © Mark Sowa/Planet Pix via ZUMA Wire)

Washington, District of Columbia, USA. 21st Oct, 2016. United States President Barack Obama makes remarks after meeting with retired NASA astronaut Scott Kelly and his his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016.Credit: Ron Sachs/Pool via CNP Credit: Ron Sachs/CNP/ZUMA Wire/Alamy Live News Stock Photo

RMH5YD3T–Washington, District of Columbia, USA. 21st Oct, 2016. United States President Barack Obama makes remarks after meeting with retired NASA astronaut Scott Kelly and his his brother Mark in the Oval Office of the White House in Washington, DC on Friday, October 21, 2016.Credit: Ron Sachs/Pool via CNP Credit: Ron Sachs/CNP/ZUMA Wire/Alamy Live News

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