Related by context. Frequent words. (Click for all words.) 79 NASA astronaut 74 Astronaut 73 astronauts 65 space shuttle 64 cosmonaut 62 International Space Station 61 spacewalker 61 spacesuit 60 NASA 60 shuttle Discovery 59 Astronauts 56 Nasa 56 Fincke 56 cosmonauts 56 space shuttle Discovery 55 spaceflight 55 crewmates 55 spacecraft 55 shuttle Endeavour 55 spaceship 54 space shuttle Endeavour 54 spacewalk 54 orbiter 53 astronaut corps 53 shuttle astronauts 53 astronauts aboard 53 shuttle 53 orbit 53 zero gravity 52 shuttle missions 52 shuttle Atlantis 52 Space Shuttle 52 Mission Control 52 spacewalking 52 Eileen Collins 52 Space Shuttle Discovery 51 spacewalks 51 spacewalkers 51 space shuttles 51 Russian cosmonauts 51 Space Station 50 Soyuz 50 Soyuz capsule 50 Russian Soyuz spacecraft 50 Endeavour 50 Christa McAuliffe 49 Space Agency 49 Soyuz spacecraft 49 Mars rover 49 weightlessness 49 manned missions 49 Alan Shepard 49 Buzz Aldrin 49 Flight Engineer 48 orbiting 48 orbiters 48 Endeavour astronauts 48 NASA Administrator 48 Yuri Gagarin 48 space shuttle Atlantis 48 Discovery astronauts 47 Aldrin 47 liftoff 47 human spaceflight 47 orbiting outpost 47 orbiting lab 46 spacesuits 46 Soyuz TMA 46 Air Force colonel 46 Lisa Nowak 46 microgravity 45 Neil Armstrong 45 Gagarin 45 Parazynski 45 outer space 45 Mike Fincke 45 astronomer 44 Cape Canaveral Fla. 44 Sally Ride 44 fighter pilot 44 spacewalking astronauts 44 Simonyi 44 Chiao 44 robotic arm 44 Atlantis 44 ISS 44 Garriott 44 Russian Soyuz 44 crewmember 44 Noguchi 43 Atlantis astronauts 43 lunar exploration 43 lunar surface 43 Baikonur Cosmodrome 43 astrophysicist 43 Polansky 43 Kennedy Space 43 Space shuttle Discovery 43 Hubble Space Telescope 43 Whitson 43 Space shuttle Endeavour