Related by context. Frequent words. (Click for all words.) 69 space shuttle 60 Space Shuttle Columbia 58 Christa McAuliffe 57 shuttle fleet 56 shuttle 56 astronauts 54 Columbia Accident Investigation 54 orbiter 54 liftoff 54 Space Shuttle 53 NASA 53 spacecraft 52 Challenger 51 space shuttles 51 shuttle Discovery 50 space shuttle Discovery 49 Soyuz capsule 49 Space Shuttle Discovery 49 Soyuz 49 Columbia disintegrated 49 spaceship 49 astronaut 49 shuttle Endeavour 48 shuttle missions 48 human spaceflight 48 insulating foam 48 thermal tiles 48 Cape Canaveral Fla. 47 spaceflight 47 Nasa 47 Deepwater Horizon 47 NASA Administrator 47 Deepwater Horizon drilling 47 heat shield 46 astronauts aboard 46 Cape Canaveral 46 Soyuz spacecraft 46 Shuttle 46 Endeavour 46 solid rocket boosters 46 space shuttle Atlantis 45 shuttle Atlantis 45 orbiters 45 Kennedy Space 45 Hubble telescope 45 International Space Station 45 Hubble Space Telescope 45 Deepwater Horizon rig 44 Dittemore 44 McAuliffe 44 Baikonur Cosmodrome 44 space shuttle Endeavour 44 Gagarin 44 shuttle astronauts 44 Atlantis 44 manned spacecraft 44 GSLV 44 Russian Soyuz spacecraft 44 lunar landing 43 foam insulation 43 Cape Canaveral Air Force 43 NASA astronaut 43 Gehman 43 Gerstenmaier 43 LCROSS 43 astronaut corps 43 Baikonur 42 Hindenburg 42 Discovery astronauts 42 Hubble 42 Astronaut 42 Mission Control 42 Yuri Gagarin 42 foam 41 Soyuz TMA 41 Saturn V 41 Concorde 41 BP Deepwater Horizon 41 SpaceX 41 orbiting laboratory 41 Sputnik 41 Alfred P. Murrah 41 Continental Connection Flight 40 Loma Prieta earthquake 40 Space Station 40 Alan Shepard 40 Endeavour astronauts 40 Baikonur cosmodrome 40 manned spaceflight 40 cosmonauts 40 booster rocket 40 Apollo 40 director Mike Leinbach 40 Eileen Collins 40 capsule 40 Russian Soyuz 40 blastoff 40 rocket booster 40 rig Deepwater Horizon 40 lander 40 crewmates