Related by context. Frequent words. (Click for all words.) 50 Tim Kopra 48 Mike Sarafin 47 Metcalf Lindenburger 47 Bresnik 46 reusable spacecraft 46 Soviet cosmonaut Yuri Gagarin 46 space shuttle 46 NASA 46 Zamka 46 Shuttle astronauts 46 shuttle Endeavour 45 UP Aerospace 45 Discovery STS 44 NASA astronaut corps 44 commander George Zamka 44 Hubble servicing 44 commander Pamela Melroy 44 shuttle Atlantis 44 Dragon capsule 44 teacher Christa McAuliffe 43 Polar Lander 43 orbiting telescope 43 Orion spacecraft 43 JAXA 43 shuttle Discovery 43 Christa McAuliffe backup 43 Shuttle Endeavour 43 shuttle Challenger 43 Gorie 43 Heidemarie Stefanyshyn Piper 43 Based Infrared 43 space shuttle Endeavour 43 Nicole Stott 43 Bill Gerstenmaier NASA 42 Wallops Flight Facility 42 interplanetary spacecraft 42 Space Shuttle Discovery 42 NASA spaceport 42 astronaut Hans Schlegel 42 Koichi Wakata 42 Shuttle Discovery 42 administrator Sean O'Keefe 42 Alan Poindexter 42 Celestis 42 Leland Melvin 42 Eileen Collins 42 SpaceX 42 shuttle 42 space shuttle Discovery 42 Space shuttle Atlantis 41 Nasa 41 Piers Sellers 41 Masten Space Systems 41 Gregory Chamitoff 41 spaceflight 41 Shane Kimbrough 41 June Scobee Rodgers 41 Commander Peggy Whitson 41 Ares IX rocket 41 Mission Control 41 Russian cosmonaut Yuri Malenchenko 41 astronaut 41 Malenchenko 41 SpaceX Falcon 9 41 robotic spacecraft 41 Space Shuttle 41 Frank De Winne 41 Nie Haisheng 41 orbiting outpost 41 Ariane rocket 40 spacecraft 40 Chamitoff 40 International Space Station 40 Dryden Flight Research 40 Gerstenmaier 40 TJ Creamer 40 Richard Linnehan 40 spaceplane 40 SPACEHAB 40 Systems Mission Directorate 40 Lyndin 40 Mike Leinbach 40 NASA astronaut 40 Bill Readdy 40 Daniel Tani 40 pressurized compartment 40 Readdy 40 aboard Endeavour 40 Ilan Ramon 40 Eyharts 40 director Tony Ceccacci 40 David Leckrone 40 Cape Canaveral Fla. 40 Sergei Volkov 40 astronaut Peggy Whitson 39 Endeavour astronauts 39 Wakata 39 Cape Canaveral 39 liftoff 39 Sturckow 39 Shenzhou VII