Related by context. Frequent words. (Click for all words.) 72 space shuttles 71 space shuttle 63 shuttle 62 shuttle missions 61 shuttle Discovery 59 shuttles 59 Space Shuttle 58 shuttle Atlantis 57 International Space Station 57 orbiters 56 astronauts 55 Soyuz 55 Soyuz spacecraft 55 space shuttle Discovery 55 human spaceflight 55 shuttle Endeavour 54 space shuttle Endeavour 54 orbiter 54 orbiting laboratory 53 orbiting outpost 53 Shuttle Discovery 53 NASA 52 Russian Soyuz spacecraft 52 space shuttle Atlantis 52 spacecraft 51 astronauts aboard 50 Columbia Accident Investigation 50 Shuttle 50 Russian Soyuz 49 Hubble Space Telescope 49 orbiting 49 shuttle astronauts 49 Nasa 49 Endeavour 48 Space Shuttle Discovery 48 Soyuz capsule 48 manned spacecraft 48 Columbia disintegrated 48 Gerstenmaier 47 orbiting lab 47 spaceflight 47 liftoff 46 Hubble 46 manned spaceflight 46 Space shuttle Discovery 46 Hubble telescope 46 Space shuttle Endeavour 46 Space Shuttle Atlantis 46 Kennedy Space 45 Space Station 45 spacewalks 45 Space shuttle Atlantis 45 ISS 45 Atlantis 45 astronaut corps 45 manned missions 45 Ariane 5 44 spacewalk 44 Soyuz TMA 44 Atlantis astronauts 44 orbit 44 Discovery astronauts 43 NASA Administrator 43 heat shield 43 insulating foam 43 Earth orbit 43 Endeavour astronauts 43 solid rocket boosters 43 Cape Canaveral Fla. 42 Space Agency 42 spacewalkers 42 Russian cosmonaut 42 Cape Canaveral 41 astronaut 41 Cape Canaveral Air Force 41 Space Shuttle Columbia 41 CAPE CANAVERAL Fla. 41 GSLV 41 Saturn V 41 CEV 41 SpaceX 40 Gehman 40 thermal tiles 40 CAPE CANAVERAL 40 Baikonur Cosmodrome 40 Atlas V 40 lunar exploration 40 gyroscopes 40 STS 40 spacewalking astronauts 39 NASA astronaut 39 Padalka 39 Bushehr plant 39 undocking 39 undock 39 JAXA 39 Dreamliner 39 Mission Control 39 Dittemore 39 spaceship 38 orbital