Mark and Scott Kelly, twin brothers and former NASA astronauts, spoke to "CBS Mornings" about how the agency is set to lose ...

NASA astronaut Scott Kelly (R), member of the 43 International Space Station crew, and his twin brother Mark pose after a news conference at Baikonur cosmodrome March 26, 2015.

Astronaut Scott Kelly will become the first UP.SE. astronaut to spend a year in space. He will help NASA collect data on the effects of long term spaceflight on a human. He will also free up seats ...

Identical 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.

Former NASA astronaut Scott Kelly knows a thing or two about isolation. In 2016, Kelly became the first American to spend 12 consecutive months in space when he completed a 340-day stint on the ...

NASA astronaut Scott Kelly smiles after returning to Earth to end a 340-day mission to the International Space Station, ending his nearly yearlong mission. He and two Russian crewmates landed in a ...

Even Scott Kelly -- a NASA astronaut who just returned to Earth after 340 days on the International Space Station -- is on board with augmented reality. Kelly tested out the Microsoft HoloLens, an ...

Astronaut Scott Kelly said today he's excited to return to Earth to see his family but added he has enough stamina to "go another year" living in space.

NASA astronaut Scott Kelly, who has spent more time in space than any other American, retired from the agency on April 1, 2016. (Image credit: NASA) ...

Former NASA astronaut Scott Kelly (L) seen at a press conference in Paris, France, in December, 2014, and Dmitry Rogozin (R) seen at a Roscosmos meeting in Sochi, Russia, in November, 2016.

Welcome home." NASA astronaut Scott Kelly hugs his daughters in Houston on March 3, 2016, after coming home from a 340-day mission aboard the International Space Station. (Image credit: NASA TV) ...