Related by context. Frequent words. (Click for all words.) 66 space shuttle 65 astronauts 64 space shuttles 62 shuttle fleet 61 shuttle Discovery 61 spacewalks 60 shuttle Atlantis 59 shuttle 58 orbiters 58 Space Shuttle 57 NASA 57 orbiter 57 International Space Station 57 space shuttle Discovery 56 spacewalk 55 shuttle Endeavour 54 liftoff 54 spacecraft 54 astronauts aboard 54 Endeavour 53 space shuttle Endeavour 53 Soyuz capsule 53 Soyuz 53 shuttle astronauts 52 astronaut 52 Space Shuttle Discovery 52 Discovery astronauts 51 Space Station 51 spacewalking astronauts 51 Russian Soyuz spacecraft 51 Atlantis 51 Gerstenmaier 50 spaceflight 50 human spaceflight 49 Russian Soyuz 49 manned spaceflight 49 orbiting outpost 49 Endeavour astronauts 49 Soyuz spacecraft 49 Nasa 48 manned missions 48 Atlantis astronauts 48 insulating foam 48 heat shield 48 shuttles 48 spacewalkers 48 STS 48 space shuttle Atlantis 47 Astronauts 47 orbit 47 spacewalking 47 Space shuttle Discovery 46 undocking 46 orbiting lab 46 Shuttle 46 Hubble 46 Columbia Accident Investigation 46 Hubble Space Telescope 46 orbiting 45 Spacewalk 45 JAXA 45 crewmates 45 foam insulation 45 Space Agency 45 lander 45 Space shuttle Endeavour 44 NASA astronaut 44 Cape Canaveral Fla. 44 Mission Control 44 Fincke 44 NASA Administrator 44 missions 44 CAPE CANAVERAL Fla. 44 Parazynski 44 Kibo 43 cosmonauts 43 Columbia disintegrated 43 thermal tiles 43 Russian cosmonauts 43 ISS 43 spaceship 43 Space shuttle Atlantis 42 Astronaut 42 spacesuit 42 undock 42 SpaceX 42 astronaut corps 41 Space Shuttle Columbia 41 SpaceShipTwo 41 Cape Canaveral 41 Cape Canaveral Air Force 41 solid rocket boosters 41 Shenzhou 41 Soyuz TMA 41 cosmonaut 41 Hubble telescope 41 Gehman 41 spacesuits 41 Kennedy Space 41 LRO 41 Eileen Collins