1 of 24
Astronaut Double Take: Identical Twins Headed for Space Station
Credit: NASA TV
Twin brothers Scott Kelly and Mark Kelly, both NASA astronauts, were once set to meet in space in 2011. Mark commanded the last mission of the space shuttle Endeavour, STS-134, while Scott led the International Space Station's Expedition 26 mission. The shuttle mission was delayed beyond Scott's time on the station, so they ultimately never met up in space. Now the twin astronauts are volunteering for science experiments as Scott Kelly prepares for a one-year mission. [Read the Full Story]
2 of 24
NASA Astronaut Scott Kelly
Credit: NASA
Scott Kelly will spend a year on the International Space Station. Some of his work will involve comparison experiments with his twin brother and former astronaut, Mark Kelly, who will be on Earth. Image uploaded on Aug. 12, 2013. [Read the Full Story]
3 of 24
Mark Kelly and Scott Kelly
Credit: NASA
Astronauts Mark Kelly, STS-134 Commander, and Scott Kelly, Expedition 26 Commander. [Read the Full Story]
4 of 24
Back on the Planet
Credit: NASA/Bill Ingalls
Expedition 26 commander Scott Kelly, wearing a turquoise wristband in honor of sister-in-law Gabrielle Giffords, looks out the window of a Russian Search and Rescue helicopter before the two hour helicopter ride to Kustanay, Kazakhstan shortly after he and fellow crew members Oleg Skripochka and Alexander Kaleri landed in their Soyuz TMA-01M capsule near the town of Arkalyk, Kazakhstan on Wednesday, March 16, 2011. [Read the Full Story]
5 of 24
NASA's Kelly Astronaut Twins Reunited
Credit: NASA
NASA astronaut Scott Kelly (left), Expedition 26 commander, is reunited with his twin brother, Mark Kelly on March 17, 2011, following a flight back to Ellington Field, Houston from Kustanay, Kazakhstan. Scott Kelly landed in Kazakhstan on March 16 with his Russian crewmates in the Soyuz TMA-01M spacecraft after 159 days in space. [Read the Full Story]
6 of 24
Astronaut Twins Headed to Space
Twin brothers Scott Kelly and Mark Kelly, both NASA astronauts, were once set to meet in space in 2011. Mark commanded the last mission of the space shuttle Endeavour, STS-134, while Scott led the International Space Station's Expedition 26 mission. The shuttle mission was delayed beyond Scott's time on the station, so they ultimately never met up in space. Now the twin astronauts are volunteering for science experiments as Scott Kelly prepares for a one-year mission. [Read the Full Story]
7 of 24
Astronaut Mark Kelly on the Space Shuttle
Credit: NASA
Astronaut Mark Kelly takes a moment for a photo near the commander's station on the forward flight deck of Space Shuttle Discovery during the STS-124 mission.
8 of 24
Astronaut Mark Kelly at 2012 State of the Union
Credit: White House Webcast
Former NASA astronaut Mark Kelly applauds President Barack Obama after the 2012 State of the Union address. Kelly sat with First Lady Michelle Obama in the First Lady's box during the president's speech while his wife, Arizona Congresswoman Gabrielle Giffords, attended on the floor of the House chamber on Jan. 24, 2012.
9 of 24
Mark E. Kelly
Credit: NASA
Astronaut Mark E. Kelly, commander of STS-124, poses for a preflight photo.
10 of 24
Farewell, Space Station
Credit: NASA TV
Expedition 26 crew members (from left) Oleg Skripochka, Scott Kelly and Alexander Kaleri bid farewell from inside the Soyuz TMA-01M spacecraft before closing the hatches on March 15, 2011. The crew landed on Earth on March 16.landed
11 of 24
gabrielle-giffords-111001-02
Credit: Congresswoman Gabrielle Giffords office
Congresswoman Gabrielle Giffords (right) with her husband, NASA astronaut Mark Kelly.
12 of 24
Stephen Colbert Visits NASA
Credit: NASA
Comedy Central’s Stephen Colbert poses with astronaut Mark Kelly at NASA's Johnson Space Center in 2010.
13 of 24
A View to Behold
Credit: NASA via Ron Garan/Astro_Ron
This stunning photo shows two astronauts, Endeavour shuttle commander Mark Kelly and space station flight engineer Ron Garan (both of NASA) gazing out at Earth through the space station's Cupola. A bright blue Earth provides a breathtaking backdrop. The photo was taken on May 25, 2011 by NASA astronaut Mike Fincke during the third spacewalk of Endeavour's STS-134 mission.
14 of 24
Astronauts' Holiday Greetings Stress Unity on Earth
Credit: NASA
NASA astronaut Scott Kelly, commander of Expedition 26 aboard the International Space Station, poses for a holiday photo near the station's miniature Christmas tree.
15 of 24
Vice President Biden Honors Mark Kelly
Credit: White House Photo by David Lienemann
Vice President Joe Biden shakes hands with Captain Mark Kelly during his retirement ceremony in the Secretary of War Suite of the Eisenhower Executive Office Building, in Washington, D.C., Oct. 6, 2011. Kelly was presented the Legion of Merit and the Distinguished Flying Cross medals by the Vice President and Kelly's wife, U.S. Rep. Gabrielle Giffords, for his 25 years of service with the Navy and NASA.
16 of 24
Kelly Hugs Giffords During Retirement Ceremony
Credit: White House Photo by David Lienemann
Captain Mark Kelly hugs his wife Congresswoman Gabrielle Giffords after receiving the Legion of Merit from Vice President Joe Biden during Captain Kelly's retirement ceremony in the Secretary of War Suite in the Eisenhower Executive Office Building, in Washington, D.C., Oct. 6, 2011.
17 of 24
Captain Mark Kelly Speaks at his Retirement Ceremony
Credit: White House Photo by David Lienemann
Captain Mark Kelly speaks at his retirement ceremony with Vice President Joe Biden in the Secretary of War Suite in the Eisenhower Executive Office Building, in Washington, D.C., Oct. 6, 2011.
18 of 24
Mark Kelly in U2 Concert Appearance
Credit: NASA
Astronaut Mark Kelly spells out a message ("It's a beautiful day") while floating on the International Space Station during a video appearance at a U2 concert in Seattle June 5.
19 of 24
Shuttle Astronauts to Dock at Space Station Today
Former schoolteacher and STS-118 mission specialist Barbara Morgan (left) and Commander Scott Kelly share thoughts on their spaceflight on Aug. 9, 2007. Image: NASA TV.
20 of 24
Mission Endeavour: Shuttle Commander, Pilot Aim for Orbit
Credit: NASA.
Astronaut Scott Kelly, STS-118 commander, dons a training version of his shuttle launch and entry suit in preparation for a training session in the Space Vehicle Mockup Facility at Johnson Space Center.
21 of 24
Mark Kelly Videochats with His Wife
Credit: Gabrielle Giffords
Rep. Gabrielle Giffords posted this picture of her husband, astronaut Mark Kelly, video-chatting from space on her Twitter account. Kelly was commanding the space shuttle Endeavour's STS-134 mission to the International Space Station at the time in May 2011.
22 of 24
President Barack Obama, First Lady Michelle Obama and Mark Kelly at Tucson Memorial Service
Credit: White House/Pete Souza
President Barack Obama, First Lady Michelle Obama and Mark Kelly (at far right), the husband of Rep. Gabrielle Giffords, listen to remarks by Daniel Hernandez, the intern who helped save the life of Rep. Giffords during the Tucson shootings. This memorial service took place at the University of Arizona in Tucson, Ariz., on Jan. 12, 2011.
23 of 24
President Obama Meets the STS-134 Crew
Credit: NASA/Bill Ingalls
President Barack Obama and First Lady Michelle Obama share a laugh with STS-134 space shuttle Endeavor commander Mark Kelly (with back to camera), right, and shuttle astronauts, from left, Andrew Feustel, European Space Agency’s Roberto Vittori, Michael Fincke, Gregory H. Johnson, and Greg Chamitoff, after their launch was scrubbed, Friday, April 29, 2011, at Kennedy Space Center in Cape Canaveral, Fla.
24 of 24
Mark Kelly in T-38 Training Jet
Credit: NASA
Astronaut Mark Kelly, STS-121 pilot, prepares for a flight in a NASA T-38 trainer jet at Ellington Field near Johnson Space Center.


















































