We now know which two astronauts will have to pack their bags very, very well in the next three years: NASA's Scott Kelly and Roscosmos' Mikhail Kornienko have been picked for the year-long stay aboard the International Space Station in 2015. Both voyagers are old hands at space travel, having each spent a total of six months in orbit and at least some time on the ISS crew. There's no great shock in the choices when the mission w
