Related by context. Frequent words. (Click for all words.) 61 June Scobee Rodgers 54 Christa McAuliffe backup 53 space shuttle 48 Rick Husband 48 Kalpana Chawla 48 astronauts 48 teacher Christa McAuliffe 48 administrator Sean O'Keefe 47 shuttle Challenger 46 Mercury Gemini 46 Soviet cosmonaut Yuri Gagarin 46 Ilan Ramon 45 Apollo astronauts 45 NASA Administrator 44 Eugene Cernan 44 Russian leased Baikonur 44 Challenger exploded 44 Eric Boe 44 spaceflight 44 Eileen Collins 44 Commander Eileen 44 Lee Archambault 44 Nie Haisheng 44 NASA astronaut corps 44 Peter Diamandis 44 Cernan 43 Challenger 43 astronaut 43 Israeli astronaut Ilan 43 Astronaut Buzz Aldrin 43 NASA 43 astronauts aboard 43 Shuttle commander 43 Edwin Buzz Aldrin 43 Cape Canaveral Fla. 43 By Irene Klotz 43 Space Shuttle Challenger 43 godspeed 43 NASA astronaut 43 G. Madhavan Nair 42 SpaceX Falcon 9 42 Jose Luis Magana 42 space shuttle Endeavour 42 Total Reads 42 Dorothy Metcalf Lindenburger 42 shuttle Discovery 42 Marcia Dunn 42 Mission Specialists 42 designer Burt Rutan 42 Fyodor Yurchikhin 42 human spaceflight 42 MOJAVE Calif. 42 Soyuz TMA 41 Christa McAuliffe 41 offered fateha 41 Dennis Tito 41 space shuttles 41 Alexander Kaleri 41 Oleg Skripochka 41 Discovery liftoff 41 chief Anatoly Perminov 41 space shuttle Discovery 41 Discovery astronauts 41 Yuri Gagarin 41 Julie Payette 41 Japanese astronaut Soichi 41 Russian Soyuz TMA 40 Chesley Sully Sullenberger 40 Space Shuttle Discovery 40 spaceflights 40 Shuttle Discovery 40 offered Fateha 40 Jared Leroy Mohler 40 Commander Peggy Whitson 40 Russian cosmonaut Yuri Malenchenko 40 Mission Control 40 shuttle astronauts 40 spacecraft 40 liftoff 40 Shuttle Launch 40 orbiter 40 Soyuz capsule 40 BAIKONUR Kazakhstan 40 shuttle 40 spaceship 40 Caldwell Dyson 39 Columbia Accident Investigation 39 Dryden Flight Research 39 Leland Melvin 39 Space Shuttle Columbia 39 Astronaut 39 Gagarin 39 shuttle disintegrated 39 Challenger Learning 39 Sally Ride 39 Ares rocket 39 Sully Sullenberger 39 Discovery STS 39 Anousheh Ansari 39 Metcalf Lindenburger 39 manager Ron Dittemore