A former space-shuttle commander whose twin brother is married to former Rep. Gabrielle Giffords will attempt the longest spaceflight ever by an American. NASA astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko will spend an entire year aboard the International Space Station beginning in 2015. The countries' space agencies announced the names of the two veteran space fliers on Monday. The extended mission was approved almost two months ago to provide a medical foundation for future missions around the moon as well as far-flung trips to asteroids and Mars. Both men already have lived aboard the space station for six months. NASA wanted experienced space-station astronauts to streamline the amount of training necessary for a one-year stint. Officials had said the list of candidates was very short. The two men will begin training next year.
