Related by context. Frequent words. (Click for all words.) 57 space shuttle 55 astronauts 54 Space Shuttle Columbia 53 Mission Control 52 space shuttle Discovery 50 Space Shuttle Discovery 50 orbiter 50 space shuttle Endeavour 49 shuttle 49 Eileen Collins 49 liftoff 49 Fincke 49 Space Shuttle 48 astronaut 47 NASA 47 Space Shuttle Endeavour 46 Endeavour 46 shuttle Discovery 46 shuttle Endeavour 45 Kennedy Space 45 Discovery astronauts 45 Space Shuttle Atlantis 45 space shuttles 45 Columbia Accident Investigation 45 shuttle astronauts 44 Columbia disintegrated 44 Mike Fincke 43 Leinbach 43 astronauts aboard 43 Shuttle Endeavour 43 Shuttle Discovery 43 Mark Polansky 43 Soyuz 43 International Space Station 43 NASA astronaut 43 shuttle missions 42 space shuttle Atlantis 42 McCool 42 spacecraft 42 Soyuz capsule 42 Dittemore 42 Nasa 42 Endeavour astronauts 42 spacewalk 42 Shuttle 42 Astronaut 41 Soyuz TMA 41 Gerstenmaier 41 shuttle Atlantis 41 thermal tiles 41 STS 41 director Mike Leinbach 40 heat shield 40 crewmates 40 Lopez Alegria 40 NASA Administrator 40 shuttle fleet 40 orbiters 40 blastoff 40 Ares IX 40 Soyuz spacecraft 40 spaceship 40 Apollo astronauts 39 cosmonauts 39 Malenchenko 39 spacewalkers 39 Astronauts 39 Giffords 39 Rep. Gabrielle Giffords 39 Melroy 38 Chamitoff 38 Padalka 38 Space shuttle Endeavour 38 undock 38 Space shuttle Atlantis 38 Cape Canaveral Fla. 38 Baikonur 38 Space shuttle Discovery 38 Hartsfield 37 Cape Canaveral Air Force 37 Flight controllers 37 Atlantis 37 cosmonaut 37 Cape Canaveral 37 Parazynski 37 orbit 37 Aldrin 37 copilot 36 Flight Engineer 36 Gabrielle Giffords 36 Gagarin 36 Space Station 36 astronaut Buzz Aldrin 36 insulating foam 36 astronaut corps 36 Discovery 35 Sunita Williams 35 Buzz Aldrin 35 Representative Gabrielle Giffords 35 spacewalks 35 lunar landing