. . . "List of NASA astronauts in 2013"@en . "List of NASA astronauts in 2013, a listing of the U.S. space agency's astronauts by 2013. In 2013 the latest Astronaut Group, group 21 was selected but they had not graduated yet, but does include those that graduated from NASA Astronaut Group 20 which was selected in 2009"@en . . . . . . . "List of NASA astronauts in 2013, a listing of the U.S. space agency's astronauts by 2013. In 2013 the latest Astronaut Group, group 21 was selected but they had not graduated yet, but does include those that graduated from NASA Astronaut Group 20 which was selected in 2009"@en .