Scott J. Kelly

Scott J. Kelly

• Mock Mars trek finds down-to-Earth sleep woes

  Astronauts have a down-to-Earth problem that could be even worse on a long trip to Mars: They cannot get enough sleep. And over time, the lack of ... 

• 

  US twin astronaut, Russian to spend year in orbit

  A former space shuttle commander whose twin brother is married to former Rep. Gabrielle Giffords will attempt the longest spaceflight ever by an ...