Related by context. Frequent words. (Click for all words.) 79 Shuttle 76 space shuttle 76 shuttles 68 shuttle Discovery 67 orbiter 67 Space Shuttle 66 space shuttle Discovery 63 spacecraft 63 space shuttles 63 shuttle fleet 62 astronauts 61 shuttle Atlantis 61 space shuttle Atlantis 61 NASA 61 Space Shuttle Discovery 60 International Space Station 60 space shuttle Endeavour 60 Endeavour 59 shuttle Endeavour 59 shuttle missions 59 orbiters 59 liftoff 58 Soyuz 58 shuttle astronauts 57 Soyuz capsule 56 Space shuttle Discovery 54 Gerstenmaier 54 Nasa 54 Shuttles 53 Atlantis 53 spaceship 53 Soyuz spacecraft 53 Kennedy Space 53 Cape Canaveral 53 orbit 53 astronaut 53 heat shield 52 Space Station 52 NASA astronaut 52 Space shuttle Endeavour 52 Atlantis astronauts 51 Hubble 51 Discovery astronauts 51 Russian Soyuz spacecraft 51 Russian Soyuz 51 Hubble Space Telescope 50 Mission Control 50 spaceflight 50 STS 50 orbiting 50 Soyuz TMA 49 Space shuttle Atlantis 49 orbiting outpost 49 human spaceflight 49 Orbiter 49 ISS 49 Hubble telescope 48 orbiting lab 48 Cape Canaveral Air Force 48 Endeavour astronauts 48 Dittemore 48 spacewalk 48 Earth orbit 48 spacewalkers 48 astronauts aboard 48 Astronauts 47 insulating foam 47 Columbia Accident Investigation 47 thermal tiles 47 Cape Canaveral Fla. 47 undocking 47 Baikonur Cosmodrome 46 Spacecraft 46 solid rocket boosters 46 lander 46 Discovery 46 Parazynski 46 Astronaut 46 Fincke 45 Leinbach 45 SpaceX 45 orbital 45 JAXA 44 spacewalks 44 foam insulation 44 director Mike Leinbach 44 CEV 44 undock 44 thermal blanket 44 Baikonur 43 spacewalking astronauts 43 KSC 43 Space Agency 43 spacesuits 43 rover 43 launch pad 43 Columbia disintegrated 43 foam 43 LCROSS 43 Eileen Collins 42 Gehman