Related by context. Frequent words. (Click for all words.) 54 Eileen Collins 51 Commander Eileen 49 Rick Husband 49 Lee Archambault 48 teacher Christa McAuliffe 48 Christa McAuliffe backup 47 space shuttle 47 shuttle Challenger 46 Christa McAuliffe 46 Nicole Stott 46 Caldwell Dyson 46 Bill Gerstenmaier NASA 46 Brent Jett 46 Mark Polansky 45 Mercury Gemini 45 shuttle Discovery 45 Eric Boe 45 Peter Diamandis 45 Hoshide 45 Ilan Ramon 45 astronaut 45 Space Shuttle Discovery 44 Michael Foale 44 commander Rick Sturckow 44 Alan Poindexter 44 Kenneth Ham 44 Mike Fincke 44 Gorie 44 Padalka 44 Shuttle commander 43 Challenger exploded 43 Bob Thirsk 43 Kalpana Chawla 43 Sturckow 43 Space Shuttle Challenger 42 Michael Lopez Alegria 42 Stephen Frick 42 space shuttle Endeavour 42 director Holly Ridings 42 Leroy Chiao 42 Foale 42 Peggy Whitson 42 Robert Satcher 42 Lopez Alegria 42 Greg Chamitoff 42 NASA astronaut 42 Mission Specialists 42 Anousheh Ansari 41 Apollo astronauts 41 Mission Control 41 Soviet cosmonaut Yuri Gagarin 41 Zamka 41 Readdy 41 Madhavan Nair 41 G Madhavan Nair 41 liftoff 41 space shuttle Discovery 41 Hobaugh 41 Wakata 41 LeRoy Cain 41 shuttle disintegrated 41 Yuri Gagarin 41 Gregory Chamitoff 41 Frank De Winne 41 Melroy 41 Shuttle astronauts 41 spokesman Valery Lyndin 41 Russian leased Baikonur 40 crewmates 40 Mikhail Kornienko 40 Women Airforce Service 40 Douglas Wheelock 40 Yang Liwei 40 cosmonaut 40 Dick Rutan 40 John Grunsfeld 40 Space Shuttle Endeavour 40 ZERO G 40 By Irene Klotz 40 Jeffrey Zaslow 40 shuttle Endeavour 40 astronauts 40 Space Shuttle Columbia 40 Daniel Tani 40 Piers Sellers 40 Scott Parazynski 40 Lee Moak 40 Edwin Buzz Aldrin 39 Tracy Caldwell Dyson 39 Shenzhou VII 39 Schirra 39 Dennis Tito 39 Chesley Sully Sullenberger 39 lunar module 39 Borschberg 39 spacecraft 39 Malenchenko 39 Tuskegee Airman 39 suborbital flight 39 astronaut Julie Payette 39 NASA Astronaut