Related by context. Frequent words. (Click for all words.) 50 NASA Astronaut 48 Bob Thirsk 47 Astronaut 47 astronaut 47 Foale 46 Sandra Magnus 46 Gregory Chamitoff 45 NASA astronaut 43 Cernan 43 Frank De Winne 43 Eileen Collins 43 Daniel Tani 42 Hoshide 42 Mike Fincke 42 astronaut Julie Payette 42 Piers Sellers 42 shuttle Challenger 41 Greg Chamitoff 41 Japanese astronaut Soichi 41 Chamitoff 41 astronaut Sunita Williams 41 Soviet cosmonaut Yuri Gagarin 41 Tombaugh 41 NASA 40 Nicole Stott 40 Hubble servicing 40 Sally Ride 40 Paolo Nespoli 40 Linnehan 40 Japanese astronaut Koichi 40 commander Peggy Whitson 40 Fincke 40 Zamka 39 Alan Shepard 39 spaceflight 39 Bresnik 39 Wakata 39 Schweickart 39 Yang Liwei 39 Malenchenko 39 Skylab 39 Hobaugh 39 Leroy Chiao 38 teacher Christa McAuliffe 38 Shuttle commander 38 aboard Endeavour 38 Scott Parazynski 38 Polansky 38 Space Shuttle Discovery 38 Peggy Whitson 38 space shuttle 38 Bolden 38 astronauts 38 Brent Jett 38 Sunita Williams 38 Whitson 38 Robonaut 2 38 astronaut Paolo Nespoli 38 Schlegel 37 Yuri Gagarin 37 cosmonaut 37 Flight Engineer 37 Mercury Gemini 37 Shuttle Endeavour 37 Wernher von Braun 37 Lovell 37 Kopra 37 orbiting telescope 37 Neil Armstrong 37 Gerst 37 Rick Husband 37 Eric Boe 37 Krikalev 37 Robert Behnken 37 Steidle 37 June Scobee Rodgers 37 Michael Foale 37 Gorie 37 Heidemarie Stefanyshyn Piper 37 Curbeam 36 Edwin Buzz Aldrin 36 Reiter 36 Buzz Aldrin 36 NASA Administrator 36 astronaut Buzz Aldrin 36 Grunsfeld 36 Gehman 36 Lopez Alegria 36 Apollo astronauts 36 Mastracchio 36 ARISS 36 shuttle 36 shuttle Atlantis 36 Anousheh Ansari 36 Peter Diamandis 36 Swigert 36 Space Shuttle Endeavour 36 Readdy 36 Cape Canaveral 36 commander Pamela Melroy 36 Shuttle Discovery