Is astronaut Mark Kelly a twin?
James Craig
Updated on February 24, 2026
During Scott's stay aboard the space station, scientists were also able to contrast the effects of spaceflight on Scott with his identical twin brother, Mark Kelly, who remained on Earth.
Keeping this in view, are the Kelly twins both astronauts?
Kelly retired from NASA in 2016. His identical twin brother, Mark Kelly, is also a retired astronaut, and the junior U.S. Senator from Arizona.
Also Know, which Kelly twin is in space? Now retired twin astronauts, Scott and Mark Kelly, are subjects of NASA's Twins Study. Scott (right) spent a year in space while Mark (left) stayed on Earth as a control subject.
Hereof, which astronaut has a twin?
Scott and Mark Kelly
Who is Scott Kelly's brother?
Mark Kelly