ISS year long mission
Scott Kelly Spent a Year in Space, and Now He Has Different DNA Than His Identical Twin Brother
Scott and Mark Kelly are identical twin brothers — at least, they were until Scott spent a year living in space.
International Space Station's 'one year crew' returns to Earth
U.S. astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko returned to Earth March 2 after spending almost a year in space in a ground-breaking experiment foreshadowing a potential manned mission to Mars.