Related by context. Frequent words. (Click for all words.) 76 shuttle 75 space shuttles 74 Space Shuttle 74 shuttle Discovery 72 astronauts 71 NASA 71 shuttle fleet 70 orbiter 69 space shuttle Discovery 68 spacecraft 67 space shuttle Endeavour 66 International Space Station 66 shuttle missions 65 astronaut 65 shuttle Endeavour 65 shuttle Atlantis 64 liftoff 64 Space Shuttle Discovery 64 spaceflight 63 Nasa 63 space shuttle Atlantis 63 orbiters 62 Endeavour 62 Soyuz 61 spaceship 60 human spaceflight 60 Shuttle 59 NASA astronaut 59 Cape Canaveral 59 Kennedy Space 58 Hubble Space Telescope 57 Soyuz spacecraft 57 Cape Canaveral Fla. 57 Atlantis 57 astronauts aboard 56 shuttle astronauts 56 Soyuz capsule 56 Mission Control 56 Columbia Accident Investigation 56 Space shuttle Discovery 56 NASA Administrator 55 Space shuttle Endeavour 55 Space Station 55 heat shield 55 Discovery astronauts 55 Gerstenmaier 55 Cape Canaveral Air Force 55 spacewalk 54 Astronauts 54 STS 53 Columbia disintegrated 53 Hubble 53 orbit 52 Astronaut 52 insulating foam 52 shuttles 52 Baikonur 52 SpaceX 52 Hubble telescope 52 Space shuttle Atlantis 52 Russian Soyuz 51 Atlantis astronauts 51 Dittemore 51 orbiting 50 thermal tiles 50 orbiting outpost 50 Leinbach 50 spacesuit 50 Mars rover 49 solid rocket boosters 49 Soyuz TMA 49 lunar exploration 49 foam insulation 49 spacewalkers 49 CAPE CANAVERAL Fla. 49 Saturn V 49 spacewalks 49 lander 49 director Mike Leinbach 48 Atlas V 48 astronaut corps 48 Earth orbit 48 crewmates 48 CAPE CANAVERAL 48 spaceships 48 JAXA 48 ISS 47 Orbiter 47 Space Exploration 47 cosmonauts 47 orbiting lab 46 Space Agency 46 undock 46 undocking 46 spacewalking 46 Alan Shepard 46 Baikonur Cosmodrome 46 LCROSS 46 Discovery 45 spacesuits 45 Gehman