Related by context. Frequent words. (Click for all words.) 75 space shuttle 72 shuttle fleet 68 orbiters 65 Space Shuttle 64 shuttle missions 63 shuttle Discovery 63 shuttle 63 astronauts 63 shuttles 63 orbiter 60 NASA 58 space shuttle Discovery 58 shuttle Atlantis 58 International Space Station 58 spacecraft 55 space shuttle Endeavour 55 Soyuz 55 spaceships 54 Endeavour 53 Hubble Space Telescope 53 shuttle Endeavour 53 Nasa 52 Soyuz spacecraft 52 human spaceflight 52 space shuttle Atlantis 51 Space Shuttle Discovery 51 Shuttle 51 astronaut 51 spaceflight 50 shuttle astronauts 50 Kennedy Space 50 Space shuttle Discovery 49 spaceship 49 Space Station 49 Atlantis 48 astronauts aboard 48 orbiting outpost 48 Russian Soyuz 48 Hubble 48 Discovery astronauts 47 orbiting 47 NASA Administrator 46 orbit 46 Space shuttle Endeavour 46 heat shield 46 Cape Canaveral 45 Hubble telescope 45 Space shuttle Atlantis 45 rovers 45 Astronauts 45 insulating foam 44 liftoff 44 NASA astronaut 44 spacewalks 44 Dittemore 43 Columbia disintegrated 43 Cape Canaveral Air Force 43 Columbia Accident Investigation 43 CAPE CANAVERAL Fla. 43 ISS 43 Astronaut 43 Earth orbit 43 spacewalk 43 CAPE CANAVERAL 43 Orbiter 42 STS 42 foam insulation 42 SpaceShipTwo 42 thermal tiles 42 CEV 42 satellites 42 lander 42 Space Exploration 42 SpaceX 42 Mars rover 42 Cape Canaveral Fla. 42 spy satellites 41 cosmonauts 41 Atlantis astronauts 41 Baikonur 41 Discovery 41 solid rocket boosters 41 Gehman 40 Mission Control 40 Fincke 40 airplanes 40 spacewalkers 40 undock 40 moon 40 spacesuit 40 Soyuz TMA 40 spacesuits 40 Space Agency 40 orbital 40 Baikonur Cosmodrome 39 JAXA 39 jumbo jets 39 Mars 39 lunar probe 39 lunar surface 39 X #B